Merge pull request #2412 from andrew-platt/b/ExtLd_use_IfW #3392

Job	Run time
build-all-debug-single	3m 45s
build-all-debug	7m 24s
build-drivers-release	5m 27s
build-postlib-release	11m 28s
build-test-uadriver-debug	1m 57s
rtest-module-drivers	4m 30s
rtest-modules-debug	11m 6s
build-interfaces-release	4m 48s
build-fastfarm-release	12m 30s
build-openfast-release	5m 10s
rtest-interfaces	3m 44s
rtest-OF	15m 33s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	1m 38s
rtest-OF-5MW_Land_AeroMap	1m 15s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	2m 14s
rtest-OF-5MW_Land_BD_DLL_WTurb	2m 30s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	5m 7s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	2m 28s
rtest-OF-simulink	11m 53s
rtest-OF-linearization	4m 53s
rtest-FF	2m 52s
	2h 2m 12s

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