Pick the default gcc/g++ from distro #122

Job	Run time
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 13)	1m 55s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 12)	1m 40s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 16)	1m 43s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 17)	2m 17s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 14)	2m 32s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 14)	1m 33s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 12)	3m 3s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 19)	1m 41s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 20)	1m 42s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 18)	2m 5s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 13)	1m 57s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 17)	1m 54s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 20)	1m 55s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 16)	2m 4s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 18)	1m 55s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 19)	1m 55s
merge	0s
	31m 51s

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