[GIT-PULLS] [php-src] PR #23247: Fix GH-23244: sync PHP 8.4 m4 file with 8.5

[email protected] (LamentXU123)
Newsgroups php.git-pulls
Message-ID <wzbFncdvg8JimgKhybWwUXZAqfbVSU6sc6uDRafJax4@main.internal.php.net> 
Pull Request: https://github.com/php/php-src/pull/23247
Author: LamentXU123

PHP 8.4 still used the older manual LDAP library detection when `--with-ldap` was passed without an explicit directory, which cause GH-23244 that only occurs on 8.4.
In 8.5 since 3677871, we've implement a better configure logic, here we can directly sync the 8.5 .m4 file to 8.4 to fix the bug (without deprecations that only affects 8.5+).

This cherry-picked:
  367787134761f8c0e90ea2b1dd402b6c5795c687
  Use pkg-config for ext/ldap without a directory (#17441)

  25e8aa5cd22d5d461a5db247cfaedbba6e85e566
  Autotools: Fix ext/ldap shared build (#18673)

  840dc1981f90edca0bbbdace5e19c3118525e75a
  fix ldap.h detection without pkgconfig (#19005)
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