Use pthread_setaffinity_np for setting affinity rather than sched_setaffinity #416

Job	Run time
binary (humble, main) / humble main	3m 14s
binary (iron, main) / iron main	3m 2s
binary (humble, testing) / humble testing	3m 17s
binary (iron, testing) / iron testing	3m 5s
binary (jazzy, main) / jazzy main	3m 4s
binary (rolling, main) / rolling main	3m 2s
binary (jazzy, testing) / jazzy testing	3m 7s
binary (rolling, testing) / rolling testing	3m 14s
	25m 5s

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