Move config.cmake.h.in files to cmake subdirectories

As Autotools already generates config.h.in files, there is a naming
inconvenience for these templates. Projects usually solve this by naming
CMake header templates with non-standard names like config.cmake.h.in or
differently (config-cmake.h.in)... Still, the name config.h.in seems the
most convenient on the expense of residing in a subdirectory.

Another option would be to do this for extensions or SAPIs inside
CMakeLists.txt but makes CMake code a bit less readable as there is no
syntax highlighting inside such bracket or quoted arguments:

|  file(CONFIGURE OUTPUT config.h CONTENT [[
|  /* Define to 1 if the PHP extension 'bcmath' is available. */
|  #cmakedefine HAVE_BCMATH 1
|  ]])

Author: petk

cmake/cmake/modules/PHP/ThreadSafety.cmake

@@ -80,9 +80,9 @@ target_compile_definitions(php_configuration INTERFACE ZTS)
 set_target_properties(php_configuration PROPERTIES PHP_THREAD_SAFETY ON)
 
 # Add compile definitions for POSIX threads conformance.
-# TODO: Recheck these definitions since many of them are deprecated or
-# obsolete in favor of the compiler automatic definitions when using threading
-# flag on such system.
+# TODO: Recheck these definitions since many of them are deprecated or obsolete
+# in favor of the compiler automatic definitions when using threading flag on
+# such system.
 target_compile_definitions(
   php_configuration
   INTERFACE

cmake/ext/bcmath/CMakeLists.txt

@@ -86,4 +86,4 @@ target_compile_definitions(php_bcmath PRIVATE ZEND_ENABLE_STATIC_TSRMLS_CACHE)
 
 set(HAVE_BCMATH TRUE)
 
-configure_file(config.cmake.h.in config.h)
+configure_file(cmake/config.h.in config.h)

cmake/ext/bcmath/config.cmake.h.in renamed to cmake/ext/bcmath/cmake/config.h.in

@@ -97,4 +97,4 @@ endif()
 
 set(HAVE_BZ2 TRUE)
 
-configure_file(config.cmake.h.in config.h)
+configure_file(cmake/config.h.in config.h)

cmake/ext/bz2/CMakeLists.txt

@@ -70,4 +70,4 @@ target_sources(
 
 set(HAVE_CALENDAR TRUE)
 
-configure_file(config.cmake.h.in config.h)
+configure_file(cmake/config.h.in config.h)

cmake/ext/bz2/config.cmake.h.in renamed to cmake/ext/bz2/cmake/config.h.in

@@ -93,4 +93,4 @@ check_include_file(mscoree.h HAVE_MSCOREE_H)
 
 set(HAVE_COM_DOTNET TRUE)
 
-configure_file(config.cmake.h.in config.h)
+configure_file(cmake/config.h.in config.h)

cmake/ext/calendar/CMakeLists.txt

@@ -64,4 +64,4 @@ target_sources(
 
 set(HAVE_CTYPE TRUE)
 
-configure_file(config.cmake.h.in config.h)
+configure_file(cmake/config.h.in config.h)