Merge sequoia-tests: run macOS tests on a macOS-latest CI runner. #653

Job	Run time
build (gcc)	1m 45s
test (gcc)	4m 8s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 42s
test (gcc, --disable-xft)	4m 7s
build (gcc, --disable-shared)	1m 59s
test (gcc, --enable-symbols)	3m 37s
build (gcc, --disable-xft)	2m 12s
build (gcc, --disable-xss)	1m 42s
build (gcc, --enable-symbols)	1m 17s
build (clang)	1m 54s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	2m 4s
build (clang, --disable-shared)	1m 57s
build (clang, --disable-xft)	2m 12s
build (clang, --disable-xss)	1m 51s
build (clang, --enable-symbols)	1m 32s
	33m 59s

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