Remove PHP/ConfigureFile

This local utility module is redundant as CMake (although with obscure
syntax) already provides some ways to generate files from templates with
values that contain generator expressions and can be adjusted for the
install prefix at the installation phase (although more hacks will be
needed here in the future).

Author: petk

cmake/cmake/modules/PHP/ConfigureFile.cmake

@@ -295,8 +295,8 @@ function(_php_main_configure_build_defs)
     CONTENT "${content}"
   )
 
-  # Regenerate file on the install step when using different installation
-  # prefix at the 'cmake --install ... --prefix <install-prefix>' phase.
+  # Regenerate file on the install step when using different installation prefix
+  # at the 'cmake --install ... --prefix <install-prefix>' phase.
   string(CONFIGURE [[
     @code@
     configure_file(