libselinux: rework selabel_file(5) database #535

Job	Run time
build (gcc, 3.11, 3.1)	1m 31s
build (gcc, 3.11, 3.1, test-flags-override)	1m 26s
build (gcc, 3.11, 3.1, test-debug)	1m 23s
build (gcc, 3.11, 3.1, linker-bfd)	1m 42s
build (gcc, 3.11, 3.1, linker-gold)	1m 33s
build (gcc, 3.10, 3.1)	1m 39s
build (gcc, 3.9, 3.1)	1m 30s
build (gcc, 3.8, 3.1)	2m 7s
build (gcc, 3.7, 3.1)	1m 32s
build (gcc, pypy3.7, 3.1)	2m 36s
build (gcc, 3.11, 3.0)	1m 41s
build (gcc, 3.11, 2.7)	1m 47s
build (gcc, 3.11, 2.6)	1m 39s
build (gcc, 3.11, 2.5)	1m 59s
build (clang, 3.11, 3.1)	1m 44s
build (clang, 3.11, 3.1, test-flags-override)	1m 32s
build (clang, 3.11, 3.1, test-debug)	1m 29s
build (clang, 3.10, 3.1)	1m 41s
build (clang, 3.9, 3.1)	1m 40s
build (clang, 3.8, 3.1)	1m 45s
build (clang, 3.7, 3.1)	1m 56s
build (clang, pypy3.7, 3.1)	2m 32s
build (clang, 3.11, 3.0)	1m 57s
build (clang, 3.11, 2.7)	2m 7s
build (clang, 3.11, 2.6)	2m 1s
build (clang, 3.11, 2.5)	1m 47s
build (gcc, 3.11, 3.1, sanitizers)	1m 55s
	48m 11s

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