Linux

CI: Use a 15 minute timeout on MacOS jobs, still hanging after r1919728. #539

Job	Run time
Default	4m 0s
Static	4m 3s
Maintainer-mode	3m 58s
Named SHM - SysV, Maintainer-mode	4m 3s
Named SHM - Classic mmap, Maintainer-mode	3m 59s
Pool-debug	3m 58s
Pool-debug, maintainer-mode	4m 15s
Thread-debug, maintainer-mode	3m 44s
Maintainer-mode, no IPv6	3m 55s
Maintainer-mode, -Werror	4m 12s
With crypto	3m 54s
ASan	4m 51s
ASan, pool-debug	4m 13s
UBsan	4m 20s
LMDB	4m 0s
Berkeley DB v5.3	4m 3s
	1h 5m 28s

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