Fixes #639: Simplify access-permissions-related code: #642

Job	Run time
build (ubuntu-20.04, 12.3.1, 10, bash, Unix Makefiles)	1m 11s
build (ubuntu-20.04, 12.2.2, 10, bash, Unix Makefiles)	1m 14s
build (ubuntu-20.04, 12.1.1, 10, bash, Unix Makefiles)	1m 50s
build (ubuntu-20.04, 12.0.1, 10, bash, Unix Makefiles)	1m 36s
build (ubuntu-20.04, 11.8, 10, bash, Unix Makefiles)	1m 40s
build (ubuntu-20.04, 11.7, 10, bash, Unix Makefiles)	1m 7s
build (ubuntu-20.04, 11.6.2, 10, bash, Unix Makefiles)	1m 6s
build (ubuntu-20.04, 11.6.1, 10, bash, Unix Makefiles)	1m 14s
build (ubuntu-20.04, 11.6, 10, bash, Unix Makefiles)	1m 19s
build (ubuntu-20.04, 11.5, 10, bash, Unix Makefiles)	2m 12s
build (ubuntu-20.04, 11.4, 10, bash, Unix Makefiles)	1m 4s
build (ubuntu-20.04, 11.3, 9, bash, Unix Makefiles)	1m 49s
build (ubuntu-20.04, 11.2, 9, bash, Unix Makefiles)	1m 5s
build (ubuntu-20.04, 11.1, 9, bash, Unix Makefiles)	53s
build (ubuntu-20.04, 11.0, 9, bash, Unix Makefiles)	51s
	20m 11s

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