Add darwin-devel Github CI job. #562

Job	Run time
unix-portable	1m 3s
MSYS2-MINGW32	2m 20s
AArch64-Switch	56s
ARM-3DS	45s
MSYS2-MINGW64	2m 18s
unix	1m 3s
unix-misc	2m 32s
unix-static	1m 34s
AddressSanitizer	1m 3s
ARM-NDS	29s
darwin-devel	1m 11s
MemorySanitizer	1m 12s
PowerPC-Wii	47s
PowerPC-WiiU	51s
UndefinedBehaviorSanitizer	1m 11s
	19m 15s

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