check for CMAKE_INSTALL_DOCDIR #5648

Job	Run time
debug64_all_tests (macos-latest)	28m 8s
debug64 (macos-latest)	28m 45s
release (macos-latest)	30m 6s
debug_all_tests (macos-latest)	16m 0s
Release64 (macos-latest)	27m 7s
debug (macos-latest)	15m 55s
release_all_tests (macos-latest)	45m 10s
Release64_all_tests (macos-latest)	41m 11s
	3h 52m 22s

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