IfW_c: update interface #1217

Job	Run time
build-postlib-release	10m 54s
build-drivers-release	5m 13s
build-all-debug	6m 57s
build-all-debug-single	3m 24s
build-test-uadriver-debug	2m 10s
rtest-module-drivers	4m 52s
rtest-modules-debug	11m 16s
build-openfast-release	5m 8s
build-interfaces-release	5m 10s
build-fastfarm-release	12m 28s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	1m 56s
rtest-OF	15m 29s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	1m 53s
rtest-OF-5MW_Land_AeroMap	1m 24s
rtest-OF-simulink	11m 3s
rtest-OF-5MW_Land_BD_DLL_WTurb	2m 11s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	5m 11s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	2m 31s
rtest-OF-linearization	5m 10s
rtest-interfaces	3m 25s
rtest-FF	2m 59s
	2h 0m 44s

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