libselinux: rework selabel_file(5) database #608

Job	Run time
build (gcc, 3.12, 3.3)	1m 46s
build (gcc, 3.12, 3.3, test-flags-override)	1m 23s
build (gcc, 3.12, 3.3, test-debug)	1m 20s
build (gcc, 3.12, 3.3, linker-bfd)	1m 33s
build (gcc, 3.12, 3.3, linker-gold)	1m 33s
build (gcc, 3.11, 3.3)	1m 28s
build (gcc, 3.10, 3.3)	1m 42s
build (gcc, 3.9, 3.3)	1m 38s
build (gcc, 3.8, 3.3)	2m 5s
build (gcc, 3.7, 3.3)	1m 43s
build (gcc, pypy3.7, 3.3)	1m 53s
build (gcc, 3.12, 3.2)	1m 40s
build (gcc, 3.12, 3.1)	1m 30s
build (gcc, 3.12, 3.0)	1m 29s
build (gcc, 3.12, 2.7)	1m 53s
build (gcc, 3.12, 2.6)	1m 50s
build (gcc, 3.12, 2.5)	1m 42s
build (clang, 3.12, 3.3)	1m 39s
build (clang, 3.12, 3.3, test-flags-override)	1m 29s
build (clang, 3.12, 3.3, test-debug)	1m 36s
build (clang, 3.11, 3.3)	1m 44s
build (clang, 3.10, 3.3)	1m 40s
build (clang, 3.9, 3.3)	1m 42s
build (clang, 3.8, 3.3)	1m 41s
build (clang, 3.7, 3.3)	1m 55s
build (clang, pypy3.7, 3.3)	2m 5s
build (clang, 3.12, 3.2)	1m 41s
build (clang, 3.12, 3.1)	1m 40s
build (clang, 3.12, 3.0)	1m 40s
build (clang, 3.12, 2.7)	1m 49s
build (clang, 3.12, 2.6)	1m 46s
build (clang, 3.12, 2.5)	1m 50s
build (gcc, 3.12, 3.3, sanitizers)	2m 8s
	56m 13s

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