libselinux: rework selabel_file(5) database #542

Job	Run time
build (gcc, 3.11, 3.1)	1m 42s
build (gcc, 3.11, 3.1, test-flags-override)	1m 43s
build (gcc, 3.11, 3.1, test-debug)	1m 26s
build (gcc, 3.11, 3.1, linker-bfd)	2m 0s
build (gcc, 3.11, 3.1, linker-gold)	1m 43s
build (gcc, 3.10, 3.1)	1m 32s
build (gcc, 3.9, 3.1)	1m 42s
build (gcc, 3.8, 3.1)	1m 33s
build (gcc, 3.7, 3.1)	1m 40s
build (gcc, pypy3.7, 3.1)	1m 57s
build (gcc, 3.11, 3.0)	1m 25s
build (gcc, 3.11, 2.7)	1m 42s
build (gcc, 3.11, 2.6)	1m 40s
build (gcc, 3.11, 2.5)	1m 39s
build (clang, 3.11, 3.1)	2m 1s
build (clang, 3.11, 3.1, test-flags-override)	1m 29s
build (clang, 3.11, 3.1, test-debug)	1m 27s
build (clang, 3.10, 3.1)	1m 49s
build (clang, 3.9, 3.1)	1m 44s
build (clang, 3.8, 3.1)	1m 40s
build (clang, 3.7, 3.1)	1m 43s
build (clang, pypy3.7, 3.1)	2m 6s
build (clang, 3.11, 3.0)	2m 39s
build (clang, 3.11, 2.7)	1m 54s
build (clang, 3.11, 2.6)	2m 39s
build (clang, 3.11, 2.5)	1m 52s
build (gcc, 3.11, 3.1, sanitizers)	1m 56s
	48m 23s

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