Move acinclude.m4 to build/php.m4

The acinclude.m4 file is in a usual Autotools build processed with
Automake's aclocal tool. Since PHP currently doesn't use Automake and
aclocal this file can be moved into the build directory. PHP build
system currently generates a combined aclocal.m4 file that Autoconf
can processes automatically.

However, a newer practice is writing all local macros in separate
dedicated files prefixed with package name, in PHP's case PHP_MACRO_NAME
and putting them in a common `m4` directory. PHP uses currently `build`
directory for this purpose.

Name `php.m4` probably most resembles such file for PHP's case.

PHP manually created the aclocal.m4 file from acinclude.m4 and
build/libtool.m4. Which is also not a particularly good practice [1], so
this patch also removes the generated alocal.m4 usage and uses
m4_include() calls manually in the configure.ac and phpize.m4 files
manually.

- sort order is not important but can be alphabetical
- list of *.m4 files prerequisites for configure script generation
  updated
- Moving m4_include() before AC_INIT also removes all comments starting
  with hash character (`#`) in the included files.

[1] https://autotools.io/autoconf/macros.html

1 files changed, 9 insertions, 0 deletions

diff --git a/scripts/phpize.m4 b/scripts/phpize.m4
index d3b471b5cd..61af6c2b74 100644
--- a/scripts/phpize.m4
+++ b/scripts/phpize.m4
@@ -1,5 +1,14 @@
 dnl This file becomes configure.ac for self-contained extensions.
 
+dnl Include external macro definitions before the AC_INIT to also remove
+dnl comments starting with # and empty newlines from the included files.
+m4_include([build/ax_check_compile_flag.m4])
+m4_include([build/ax_gcc_func_attribute.m4])
+m4_include([build/libtool.m4])
+m4_include([build/php_cxx_compile_stdcxx.m4])
+m4_include([build/php.m4])
+m4_include([build/pkg.m4])
+
 AC_PREREQ([2.68])
 AC_INIT
 AC_CONFIG_SRCDIR([config.m4])