libselinux: rework selabel_file(5) database #609

Job	Run time
build (gcc, 3.12, 3.3)	1m 53s
build (gcc, 3.12, 3.3, test-flags-override)	1m 22s
build (gcc, 3.12, 3.3, test-debug)	1m 23s
build (gcc, 3.12, 3.3, linker-bfd)	1m 33s
build (gcc, 3.12, 3.3, linker-gold)	1m 40s
build (gcc, 3.11, 3.3)	1m 36s
build (gcc, 3.10, 3.3)	1m 41s
build (gcc, 3.9, 3.3)	2m 7s
build (gcc, 3.8, 3.3)	1m 42s
build (gcc, 3.7, 3.3)	1m 40s
build (gcc, pypy3.7, 3.3)	2m 2s
build (gcc, 3.12, 3.2)	1m 51s
build (gcc, 3.12, 3.1)	1m 32s
build (gcc, 3.12, 3.0)	1m 34s
build (gcc, 3.12, 2.7)	2m 0s
build (gcc, 3.12, 2.6)	1m 48s
build (gcc, 3.12, 2.5)	1m 53s
build (clang, 3.12, 3.3)	1m 49s
build (clang, 3.12, 3.3, test-flags-override)	1m 30s
build (clang, 3.12, 3.3, test-debug)	1m 31s
build (clang, 3.11, 3.3)	1m 34s
build (clang, 3.10, 3.3)	1m 48s
build (clang, 3.9, 3.3)	2m 7s
build (clang, 3.8, 3.3)	1m 40s
build (clang, 3.7, 3.3)	1m 44s
build (clang, pypy3.7, 3.3)	2m 5s
build (clang, 3.12, 3.2)	1m 38s
build (clang, 3.12, 3.1)	1m 37s
build (clang, 3.12, 3.0)	1m 37s
build (clang, 3.12, 2.7)	1m 54s
build (clang, 3.12, 2.6)	1m 52s
build (clang, 3.12, 2.5)	1m 59s
build (gcc, 3.12, 3.3, sanitizers)	1m 59s
	57m 41s

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