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Update ax_cxx_compile_stdcxx.m4 (or remove serial)
Update the bundled ax_cxx_compile_stdcxx.m4 once https://github.com/autoconf-archive/autoconf-archive/pull/218 or something similar lands.
Should all "keep default if OK" features be rejected we should probably remove the serial from ax_cxx_compile_stdcxx.m4 to prevent automatic upgrades to a version that doesn't support avoiding C++ standard version downgrades.