Use current Autoconf versions format

The backticks in these docs related files were replaced since Autoconf
2.72 version.

Author: petk

docs/autotools/PHP-4.0.txt

@@ -4,7 +4,7 @@ Configuration:
   --cache-file=FILE       cache test results in FILE
   --help                  print this message
   --no-create             do not create output files
-  --quiet, --silent       do not print `checking...' messages
+  --quiet, --silent       do not print 'checking...' messages
   --version               print the version of autoconf that created configure
 Directory and file names:
   --prefix=PREFIX         install architecture-independent files in PREFIX

docs/autotools/PHP-4.1.txt

@@ -4,7 +4,7 @@ Configuration:
   --cache-file=FILE       cache test results in FILE
   --help                  print this message
   --no-create             do not create output files
-  --quiet, --silent       do not print `checking...' messages
+  --quiet, --silent       do not print 'checking...' messages
   --version               print the version of autoconf that created configure
 Directory and file names:
   --prefix=PREFIX         install architecture-independent files in PREFIX

docs/autotools/PHP-4.2.txt

@@ -4,7 +4,7 @@ Configuration:
   --cache-file=FILE       cache test results in FILE
   --help                  print this message
   --no-create             do not create output files
-  --quiet, --silent       do not print `checking...' messages
+  --quiet, --silent       do not print 'checking...' messages
   --version               print the version of autoconf that created configure
 Directory and file names:
   --prefix=PREFIX         install architecture-independent files in PREFIX

docs/autotools/PHP-4.3.txt

@@ -4,7 +4,7 @@ Configuration:
   --cache-file=FILE       cache test results in FILE
   --help                  print this message
   --no-create             do not create output files
-  --quiet, --silent       do not print `checking...' messages
+  --quiet, --silent       do not print 'checking...' messages
   --version               print the version of autoconf that created configure
 Directory and file names:
   --prefix=PREFIX         install architecture-independent files in PREFIX

docs/autotools/PHP-4.4.txt

@@ -4,7 +4,7 @@ Configuration:
   --cache-file=FILE       cache test results in FILE
   --help                  print this message
   --no-create             do not create output files
-  --quiet, --silent       do not print `checking...' messages
+  --quiet, --silent       do not print 'checking...' messages
   --version               print the version of autoconf that created configure
 Directory and file names:
   --prefix=PREFIX         install architecture-independent files in PREFIX

docs/autotools/PHP-5.0.txt

@@ -4,7 +4,7 @@ Configuration:
   --cache-file=FILE       cache test results in FILE
   --help                  print this message
   --no-create             do not create output files
-  --quiet, --silent       do not print `checking...' messages
+  --quiet, --silent       do not print 'checking...' messages
   --version               print the version of autoconf that created configure
 Directory and file names:
   --prefix=PREFIX         install architecture-independent files in PREFIX

docs/autotools/PHP-5.1.txt

@@ -4,7 +4,7 @@ Configuration:
   --cache-file=FILE       cache test results in FILE
   --help                  print this message
   --no-create             do not create output files
-  --quiet, --silent       do not print `checking...' messages
+  --quiet, --silent       do not print 'checking...' messages
   --version               print the version of autoconf that created configure
 Directory and file names:
   --prefix=PREFIX         install architecture-independent files in PREFIX

docs/autotools/PHP-5.2.txt

@@ -4,7 +4,7 @@ Configuration:
   --cache-file=FILE       cache test results in FILE
   --help                  print this message
   --no-create             do not create output files
-  --quiet, --silent       do not print `checking...' messages
+  --quiet, --silent       do not print 'checking...' messages
   --version               print the version of autoconf that created configure
 Directory and file names:
   --prefix=PREFIX         install architecture-independent files in PREFIX

docs/autotools/PHP-5.3.txt

@@ -4,7 +4,7 @@ Configuration:
   --cache-file=FILE       cache test results in FILE
   --help                  print this message
   --no-create             do not create output files
-  --quiet, --silent       do not print `checking...' messages
+  --quiet, --silent       do not print 'checking...' messages
   --version               print the version of autoconf that created configure
 Directory and file names:
   --prefix=PREFIX         install architecture-independent files in PREFIX

docs/autotools/PHP-5.4.txt

@@ -1,4 +1,4 @@
-`configure' configures this package to adapt to many kinds of systems.
+'configure' configures this package to adapt to many kinds of systems.
 
 Usage: ./configure [OPTION]... [VAR=VALUE]...
 
@@ -12,22 +12,22 @@ Configuration:
       --help=short        display options specific to this package
       --help=recursive    display the short help of all the included packages
   -V, --version           display version information and exit
-  -q, --quiet, --silent   do not print `checking ...' messages
+  -q, --quiet, --silent   do not print 'checking ...' messages
       --cache-file=FILE   cache test results in FILE [disabled]
-  -C, --config-cache      alias for `--cache-file=config.cache'
+  -C, --config-cache      alias for '--cache-file=config.cache'
   -n, --no-create         do not create output files
-      --srcdir=DIR        find the sources in DIR [configure dir or `..']
+      --srcdir=DIR        find the sources in DIR [configure dir or '..']
 
 Installation directories:
   --prefix=PREFIX         install architecture-independent files in PREFIX
                           [/usr/local]
   --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX
                           [PREFIX]
 
-By default, `make install' will install all the files in
-`/usr/local/bin', `/usr/local/lib' etc.  You can specify
-an installation prefix other than `/usr/local' using `--prefix',
-for instance `--prefix=$HOME'.
+By default, 'make install' will install all the files in
+'/usr/local/bin', '/usr/local/lib' etc.  You can specify
+an installation prefix other than '/usr/local' using '--prefix',
+for instance '--prefix=$HOME'.
 
 For better control, use the options below.
 
@@ -393,17 +393,17 @@ Some influential environment variables:
   CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
               you have headers in a nonstandard directory <include dir>
   CPP         C preprocessor
-  YACC        The `Yet Another Compiler Compiler' implementation to use.
-              Defaults to the first program found out of: `bison -y', `byacc',
-              `yacc'.
+  YACC        The 'Yet Another Compiler Compiler' implementation to use.
+              Defaults to the first program found out of: 'bison -y', 'byacc',
+              'yacc'.
   YFLAGS      The list of arguments that will be passed by default to $YACC.
               This script will default YFLAGS to the empty string to avoid a
-              default value of `-d' given by some make applications.
+              default value of '-d' given by some make applications.
   CXX         C++ compiler command
   CXXFLAGS    C++ compiler flags
   CXXCPP      C++ preprocessor
 
-Use these variables to override the choices made by `configure' or to help
+Use these variables to override the choices made by 'configure' or to help
 it to find libraries and programs with nonstandard names/locations.
 
 Report bugs to the package provider.