Merge pull request #2621 from andrew-platt/b/SFunc_build #3824

Job	Run time
build-postlib-release	11m 46s
build-all-debug	6m 40s
build-all-debug-single	2m 57s
build-drivers-release	5m 32s
build-test-uadriver-debug	1m 21s
rtest-module-drivers	4m 59s
rtest-modules-debug	10m 41s
build-interfaces-release	4m 40s
build-fastfarm-release	13m 15s
build-openfast-release	4m 54s
rtest-interfaces	3m 20s
rtest-openfast_io	6m 43s
rtest-OF-simulink	12m 25s
rtest-OF	16m 16s
rtest-OF-5MW_Land_AeroMap	1m 15s
rtest-OF-5MW_Land_BD_DLL_WTurb	2m 16s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	2m 8s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	4m 59s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	2m 33s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	1m 58s
rtest-OF-linearization	4m 32s
rtest-FF	3m 2s
	2h 8m 12s

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