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maint: avoid clang masquerading as gcc in ManyConfigTests (#671) #888

Job	Run time
GCC -O0	1m 59s
GCC -Os, old Autotools	1m 1s
Windows (Win32)	2m 17s
Bazel (ubuntu-24.04)	16s
Bazel (windows-latest)	1m 4s
manyconfig	26m 48s
perl	17s
CMake unity build	41s
GCC -O3	59s
Check autogenerated file freshness	27s
Clang (-O0)	2m 24s
Clang (-O2)	3m 47s
MSYS2 (UCRT64)	1m 58s
MSYS2 (MSYS)	1m 49s
Windows (x64)	1m 33s
Multiarch (s390x, ubuntu_latest)	10m 39s
GCC -Os, CMake+ninja, no JIT	1m 3s
Multiarch (ppc64le, ubuntu_latest)	11m 4s
Multiarch (armv7, ubuntu_latest)	11m 33s
Zig	34s
Multiarch (aarch64, ubuntu_latest)	12m 41s
Multiarch (riscv64, ubuntu_latest)	11m 17s
	1h 46m 11s

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