Added threads preference in CMakeLists.txt to complement addition of … #631

Job	Run time
call_workflow / Start self-hosted EC2 runner	8m 0s
call_workflow / Clone and build	2m 4s
call_workflow / Stop self-hosted EC2 runner	50s
call_workflow / Run test suite	0s
call_workflow / Upload artifacts to repo	0s
call_workflow / Publish to S3	0s
	10m 54s

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