Use llvm-ar on darwin #436

Job	Run time
sys_paths_test	4m 29s
container_test (archlinux)	3m 16s
container_test (debian)	2m 54s
container_test (fedora)	3m 42s
container_test (suse_leap)	4m 33s
container_test (suse_tumbleweed)	3m 28s
container_test (ubuntu_20_04)	3m 37s
container_test (ubuntu_22_04)	2m 56s
container_test (linux_sysroot)	3m 1s
test (macos-latest, run_tests.sh, latest)	7m 6s
test (macos-latest, run_tests.sh, 5.1.0)	4m 46s
test (macos-latest, run_external_tests.sh, latest)	16m 51s
test (ubuntu-latest, run_tests.sh, latest)	3m 5s
test (ubuntu-latest, run_tests.sh, 5.1.0)	2m 23s
test (ubuntu-latest, run_external_tests.sh, latest)	8m 8s
abs_paths_test	2m 53s
xcompile_test	3m 12s
	1h 20m 20s

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