Copter Fence Fixes #38379

Job	Run time
build (base)	8m 41s
build (clang)	8m 12s
build-gcc-heli	6m 55s
autotest (sitltest-copter-tests1a)	11m 48s
autotest (sitltest-copter-tests1b)	13m 34s
autotest (sitltest-copter-tests1c)	15m 41s
autotest (sitltest-copter-tests1d)	13m 57s
autotest (sitltest-copter-tests1e)	13m 27s
autotest (sitltest-copter-tests2a)	13m 24s
autotest (sitltest-copter-tests2b)	33m 38s
autotest-heli (sitltest-heli)	13m 51s
	2h 33m 8s

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