Disable PACKAGE_* preprocessor symbols

Autoconf defines PACKAGE_* symbols:
- PACKAGE_NAME
- PACKAGE_VERSION
- PACKAGE_TARNAME
- PACKAGE_STRING
- PACKAGE_BUGREPORT
- PACKAGE_URL

and appends them to the generated config.h.in files. With AC_INIT change
via afd52f9 where package version, URL,
bug report location are defined, these preprocessor macros are then non
empty strings. When using phpize, PHP shares the config files in
extensions, warnings of redefined macros appear, such as:
- `warning: 'PACKAGE_NAME' macro redefined`

This patch now disables these non utilized symbols in the generated
config header files.

Better practice would be to include only API specific headers where
needed but this would require even more refactorings. Some extensions
such as pcre, pgsql, and pdo_pgsql solve this issue by undefining some
of these symbols before including the library configuration headers in
the code also. Because these symbols can be defined by any library which
uses Autotools.

Additionally, the unused PACKAGE_* symbols were cleaned for the bundled
libmbfl library.

Author: petk

configure.ac

@@ -1726,4 +1726,12 @@ Check '[$]0 --help' for available options
 
 fi
 ])
+
+AC_CONFIG_COMMANDS_POST([
+  # Disable PACKAGE_* symbols in main/php_config.h.in
+  $SED -e 's/^#undef PACKAGE_[^ ]*/\/\* & \*\//g' < $srcdir/main/php_config.h.in \
+    > $srcdir/main/php_config.h.in.tmp && \
+    mv $srcdir/main/php_config.h.in.tmp $srcdir/main/php_config.h.in
+])
+
 AC_OUTPUT

ext/mbstring/libmbfl/config.h.in

@@ -42,30 +42,6 @@
    */
 #undef LT_OBJDIR
 
-/* Name of package */
-#undef PACKAGE
-
-/* Define to the address where bug reports for this package should be sent. */
-#undef PACKAGE_BUGREPORT
-
-/* Define to the full name of this package. */
-#undef PACKAGE_NAME
-
-/* Define to the full name and version of this package. */
-#undef PACKAGE_STRING
-
-/* Define to the one symbol short name of this package. */
-#undef PACKAGE_TARNAME
-
-/* Define to the home page for this package. */
-#undef PACKAGE_URL
-
-/* Define to the version of this package. */
-#undef PACKAGE_VERSION
-
-/* Version number of package */
-#undef VERSION
-
 /* Define to rpl_malloc if the replacement function should be used. */
 #undef malloc
 

scripts/phpize.m4

@@ -205,4 +205,11 @@ test -d modules || $php_shtool mkdir modules
 
 AC_CONFIG_HEADERS([config.h])
 
+AC_CONFIG_COMMANDS_POST([
+  # Disable PACKAGE_* symbols in config.h.in
+  $SED -e 's/^#undef PACKAGE_[^ ]*/\/\* & \*\//g' < $srcdir/config.h.in \
+    > $srcdir/config.h.in.tmp && \
+    mv $srcdir/config.h.in.tmp $srcdir/config.h.in
+])
+
 AC_OUTPUT