Test: gcc-12.4.0-0.RC+20240613

[ASSI]

The native Gcc compilers have been updated to the first release
candidate version for the upcoming gcc-12.4.0:

 gcc-12.4.0-0.RC+20240613

This build does _not_ incorporate the experimental patch to use the
newlib locale function in libstdc++ so that other locales (aside from
"C") become usable.

Cygwin does not allow multiple versions of the compilers to be installed
concurrently.  Once gcc-12.4.0 is released, it is expected to replace
the gcc-11.4.0 on Cygwin.

For this build, the D compiler has been disabled since it does not
bootstrap due to the missing Phobos runtime on Cygwin.  No testing
beyond the compiler testsuite has been done.


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