[Clang] failure in test suite due to new warning added in 22.1.x

[Crivella]

Following the addition of the warning for missing libstdc++ when detecting the GCC toolchain

• [Clang] Take libstdc++ into account during GCC detection #145056

Some tests in the Clang and Clang tools test suite can fail do to the warning popping up on system where multiple GCC are installed, the latest of which without libstdc++

For more details see discussion in easybuilders/easybuild-easyblocks#4078 (comment)

In our case we rely on compiler configuration files, but this problem should happen regardless depending on system installs

[AaronBallman]

CC @frederik-h

[frederik-h]

CC @frederik-h

Thanks for the CC. I will try to understand if the observed behavior is expected or not.