linux

Add clang-3.4 #7956

Job	Run time
build (g++-11, Release, 11)	2m 14s
build (g++-4.9, Release, 11)	2m 11s
build (g++-4.9, Debug, 11)	1m 35s
build (g++-11, Debug, 11)	1m 22s
build (clang++-11, Debug, 17, -DFMT_FUZZ=ON -DFMT_FUZZ_LINKMAIN=ON, sudo apt install clang-11)	1m 44s
build (clang++-11, Release, 11)	2m 10s
build (clang++-11, Debug, 17, -stdlib=libc++, sudo apt install clang-11 libc++-11-dev libc++abi-1...	1m 39s
build (clang++-3.6, Release, 11)	1m 33s
build (g++-11, Debug, 17)	1m 7s
build (clang++-11, Debug, 11)	1m 25s
build (g++-11, Debug, 20, sudo apt install g++-11)	54s
build (g++-11, Debug, 14, sudo apt install g++-11)	46s
build (g++-13, Release, 23, -DBUILD_SHARED_LIBS=ON, sudo apt install g++-13)	55s
build (clang++-3.6, Debug, 11)	55s
	20m 30s

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