[ruby-core:122299] [Ruby Bug#21340] Bump autoconf version to properly handle C23 bool/stdbool defines

Issue #21340 has been updated by alanwu (Alan Wu).


We can't backport to 3.2 since that would break older Visual Studio versions that it supports. 

Maybe we need to bump autoconf for 3.2.

----------------------------------------
Bug #21340: Bump autoconf version to properly handle C23 bool/stdbool defines
https://bugs.ruby-lang.org/issues/21340#change-113443

* Author: christo (Chris Alberti)
* Status: Closed
* ruby -v: 3.4.3, 3.5.0, any built with GCC 15 (so C23)
* Backport: 3.2: WONTFIX, 3.3: REQUIRED, 3.4: REQUIRED
----------------------------------------
Right now if I install a recent release using rbenv or asdf, or manually download the latest release 3.4.3 or the preview 3.5.0, the included `./configure` seems to have been generated by an old version of autoconf. After running `./configure`, I end up with a `config.h` containing `HAVE__BOOL = 1`, but _not_ containing `HAVE_STD_BOOL_H = 1`.

If I grab the source from github (latest, or 3.4.3 tag) and run autoconf myself (I'm currently on 2.72), I get a config.h with both `HAVE__BOOL = 1` and `HAVE_STD_BOOL_H = 1` defined.

This ends up meaning that in the official releases, Ruby's internal/stdbool.h skips using <stdbool.h> and moves on to defining bool/true/false itself. 

This is not valid as of C23 (which is now default in GCC 15). On my end I found this because I was seeing build failures in the geoip2_compat gem related to issues with the bool type definition on GCC 15. I submitted a patch to the gem's repo for a workaround (include <stdbool.h> before ruby.h), but this might come back to bite other native extension gem compiles as well.

It looks like autoconf was patched to fix the HAVE_STD_BOOL_H define for C23 in [this commit](https://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=6dcecb780a69bd208088d666b299e92aa7ae7e80;hp=f6657256a37da44c987c04bf9cd75575dfca3b60). 

I can tell that the ./configure included in the official ruby releases was created with an older version of autoconf because I still see the line:
```
Check for stdbool.h that conforms to C99
```
rather than the updated version (which appears in my ./configure created with autoconf 2.72)
```
Check for stdbool.h that conforms to C99 or later
```

I'd happily submit a PR if the setup around packaging the official releases is public and someone can point me to it! I wasn't able to find it on a quick search.

---Files--------------------------------
config.h_GCC14 (14.7 KB)
config.h_GCC15 (14.7 KB)


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