Don't build xz, not used by anything #974

Job	Run time
build (ubuntu-24.04-arm, aarch64, bash)	44m 59s
build (macos-13, x86_64, bash)	34m 25s
build (ubuntu-24.04, i686, bash)	52m 25s
build (macos-14, arm64, bash)	12m 16s
build (ubuntu-24.04, x86_64, bash)	1h 12m 33s
build (windows-latest, AMD64, msys2 {0}, mingw-w64-x86_64, MINGW64)	1h 28m 9s
	5h 4m 47s

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