libselinux: rework selabel_file(5) database #543

Job	Run time
build (gcc, 3.11, 3.1)	1m 34s
build (gcc, 3.11, 3.1, test-flags-override)	1m 22s
build (gcc, 3.11, 3.1, test-debug)	1m 26s
build (gcc, 3.11, 3.1, linker-bfd)	1m 43s
build (gcc, 3.11, 3.1, linker-gold)	1m 35s
build (gcc, 3.10, 3.1)	1m 31s
build (gcc, 3.9, 3.1)	1m 36s
build (gcc, 3.8, 3.1)	1m 36s
build (gcc, 3.7, 3.1)	1m 41s
build (gcc, pypy3.7, 3.1)	2m 3s
build (gcc, 3.11, 3.0)	1m 31s
build (gcc, 3.11, 2.7)	1m 43s
build (gcc, 3.11, 2.6)	1m 43s
build (gcc, 3.11, 2.5)	1m 42s
build (clang, 3.11, 3.1)	1m 36s
build (clang, 3.11, 3.1, test-flags-override)	1m 36s
build (clang, 3.11, 3.1, test-debug)	1m 34s
build (clang, 3.10, 3.1)	1m 42s
build (clang, 3.9, 3.1)	2m 1s
build (clang, 3.8, 3.1)	1m 46s
build (clang, 3.7, 3.1)	1m 51s
build (clang, pypy3.7, 3.1)	2m 3s
build (clang, 3.11, 3.0)	1m 35s
build (clang, 3.11, 2.7)	1m 51s
build (clang, 3.11, 2.6)	1m 58s
build (clang, 3.11, 2.5)	1m 49s
build (gcc, 3.11, 3.1, sanitizers)	1m 56s
	46m 4s

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