Use autoconf 2.72 for ruby 3.4 and head (gcc 15)

[ntkme]

• Fixes C23 bool/stdbool broken on 3.4.4 and head rubyinstaller2#439
• https://bugs.ruby-lang.org/issues/21340

We can either do WANT_AUTOCONF='2.72' autoreconf -fi or do a patch like this PR. The reason I choose to use a patch is that it's more explicit, and the patch will fail when upstream catchup so that we will know when to revert the patch.

Regarding how autoconf version is picked: https://www.msys2.org/docs/autotools/

If WANT_AUTOCONF is not defined, it searches version string in existing configure. Therefore we can patch configure to force it pick a different version.

[ntkme]

To confirm that this is working - before the patch the build log has:

  checking for stdbool.h that conforms to C99... no

after the patch the build log has:

  checking for stdbool.h that conforms to C99 or later... yes

[larskanis]

I noticed the stdbool error somewhere before the release, but forgot about it, unfotunatelly. Great work however! Will make a new release tomorrow. After adding a test case.

[MSP-Greg]

Thanks to both of you for this.

Reminder, I believe backports are being done, so 3.2.9 and 3.3.9 may need the same change.