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Backport upstream patch for C++23 support on ax_cxx_compile_stdcxx.m4.
This is needed by Asterisk package to correctly configure.
It's currently not possible to bump to a more recent autoconf-archive
release 2024.10.16 as it's currently affected by multiple BUGs ([1])
[1] e1acc7a67b
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>