libselinux: rework selabel_file(5) database #516

Job	Run time
build (gcc, 3.11, 3.1)	2m 21s
build (gcc, 3.11, 3.1, test-flags-override)	2m 51s
build (gcc, 3.11, 3.1, test-debug)	2m 46s
build (gcc, 3.11, 3.1, linker-bfd)	2m 36s
build (gcc, 3.11, 3.1, linker-gold)	2m 27s
build (gcc, 3.10, 3.1)	3m 3s
build (gcc, 3.9, 3.1)	3m 46s
build (gcc, 3.8, 3.1)	3m 38s
build (gcc, 3.7, 3.1)	2m 46s
build (gcc, pypy3.7, 3.1)	4m 4s
build (gcc, 3.11, 3.0)	2m 56s
build (gcc, 3.11, 2.7)	3m 52s
build (gcc, 3.11, 2.6)	4m 45s
build (gcc, 3.11, 2.5)	2m 56s
build (clang, 3.11, 3.1)	2m 59s
build (clang, 3.11, 3.1, test-flags-override)	2m 47s
build (clang, 3.11, 3.1, test-debug)	2m 12s
build (clang, 3.10, 3.1)	3m 0s
build (clang, 3.9, 3.1)	2m 54s
build (clang, 3.8, 3.1)	4m 16s
build (clang, 3.7, 3.1)	3m 0s
build (clang, pypy3.7, 3.1)	4m 12s
build (clang, 3.11, 3.0)	3m 29s
build (clang, 3.11, 2.7)	4m 48s
build (clang, 3.11, 2.6)	3m 40s
build (clang, 3.11, 2.5)	4m 21s
build (gcc, 3.11, 3.1, sanitizers)	3m 23s
	1h 29m 48s

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