GnuTLS | Fails to build properly with autoconf 2.72.90 (2.73 pre-release) (#1806)

Ross Burton created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1806



If I build gnutls with autoconf 2.72.90 (the 2.73 pre-release) then the compiler is mis-detected:

```
WARNING: Compiler does not support C99. It may not be able to compile the project.
```

This is GCC 15.2, it most certainly does support C99.  However, the configure code in `gnutls/configure.ac.` responsible for this check is quite broken:

```
AS_CASE([$ac_prog_cc_stdc],
  [c11 | c99], [AC_DEFINE([C99_MACROS], 1, [C99 macros are supported])],
  [AC_MSG_WARN([[Compiler does not support C99. It may not be able to compile the project.]])]
)
```

This is because `ac_prog_cc_stdc` is now `c23`, due to this change in autoconf:

```
*** AC_PROG_CC now prefers C23 if available.
```

This is trivially fixed by adding `c23` to the list of available standards, but the test is very fragile.  Does gnutls even need to cater for non-C99 compilers?  That's a pretty niche market these days, surely.

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