Add OpenMP option to presets #62

Job	Run time
Linux build (mkl)	5m 47s
Mac build (accelerate)	3m 22s
Windows build (mkl)	4m 47s
Windows build (openblas)	4m 19s
Linux build (openblas / static)	6m 12s
Linux build (openblas)	5m 53s
Windows build openblas installed (mkl)	5m 37s
Mac build (accelerate / static)	3m 27s
	39m 24s

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