Remove deprecated PHP_EXTENSION m4 macro

The PHP_EXTENSION macro was used before the introduction of the updated
build system in the 9d9d39a. The
extensions at that time possibly still used the Makefile.in and Automake
and the PHP_EXTENSION macro has been replaced with the PHP_NEW_EXTENSION
macro.

Today, the once deprecated macro can be removed in favor of only
PHP_NEW_EXTENSION macro.

Author: petk

acinclude.m4

@@ -886,17 +886,6 @@ AC_DEFUN([PHP_SELECT_SAPI],[
   ])
 ])
 
-dnl deprecated
-AC_DEFUN([PHP_EXTENSION],[
-  sources=`$AWK -f $abs_srcdir/build/scan_makefile_in.awk < []PHP_EXT_SRCDIR($1)[]/Makefile.in`
-
-  PHP_NEW_EXTENSION($1, $sources, $2, $3)
-
-  if test -r "$ext_srcdir/Makefile.frag"; then
-    PHP_ADD_MAKEFILE_FRAGMENT
-  fi
-])
-
 AC_DEFUN([PHP_ADD_BUILD_DIR],[
   ifelse($2,,[
     BUILD_DIR="$BUILD_DIR $1"

build/scan_makefile_in.awk

@@ -7,7 +7,6 @@ phpbuilddir = $(libdir)/build
 
 BUILD_FILES = \
 	scripts/phpize.m4 \
-	build/scan_makefile_in.awk \
 	build/libtool.m4 \
 	build/ltmain.sh \
 	build/ax_check_compile_flag.m4 \

scripts/Makefile.frag

@@ -9,7 +9,7 @@ includedir="`eval echo @includedir@`/php"
 builddir="`pwd`"
 SED="@SED@"
 
-FILES_BUILD="scan_makefile_in.awk shtool libtool.m4 ax_check_compile_flag.m4 ax_gcc_func_attribute.m4 php_cxx_compile_stdcxx.m4 pkg.m4 config.guess config.sub ltmain.sh"
+FILES_BUILD="shtool libtool.m4 ax_check_compile_flag.m4 ax_gcc_func_attribute.m4 php_cxx_compile_stdcxx.m4 pkg.m4 config.guess config.sub ltmain.sh"
 FILES="acinclude.m4 Makefile.global run-tests*.php"
 CLEAN_FILES="$FILES *.o *.lo *.la .libs/ build/ modules/ install-sh \
 	mkinstalldirs missing config.nice configure configure.ac \