libselinux: rework selabel_file(5) database #544

Job	Run time
build (gcc, 3.11, 3.1)	1m 55s
build (gcc, 3.11, 3.1, test-flags-override)	1m 17s
build (gcc, 3.11, 3.1, test-debug)	1m 38s
build (gcc, 3.11, 3.1, linker-bfd)	1m 58s
build (gcc, 3.11, 3.1, linker-gold)	1m 28s
build (gcc, 3.10, 3.1)	1m 35s
build (gcc, 3.9, 3.1)	1m 58s
build (gcc, 3.8, 3.1)	1m 36s
build (gcc, 3.7, 3.1)	1m 36s
build (gcc, pypy3.7, 3.1)	1m 56s
build (gcc, 3.11, 3.0)	1m 26s
build (gcc, 3.11, 2.7)	1m 51s
build (gcc, 3.11, 2.6)	3m 19s
build (gcc, 3.11, 2.5)	1m 48s
build (clang, 3.11, 3.1)	1m 41s
build (clang, 3.11, 3.1, test-flags-override)	1m 31s
build (clang, 3.11, 3.1, test-debug)	2m 2s
build (clang, 3.10, 3.1)	1m 35s
build (clang, 3.9, 3.1)	1m 43s
build (clang, 3.8, 3.1)	1m 47s
build (clang, 3.7, 3.1)	1m 54s
build (clang, pypy3.7, 3.1)	2m 40s
build (clang, 3.11, 3.0)	1m 36s
build (clang, 3.11, 2.7)	1m 46s
build (clang, 3.11, 2.6)	1m 46s
build (clang, 3.11, 2.5)	2m 4s
build (gcc, 3.11, 3.1, sanitizers)	1m 58s
	49m 24s

Provide feedback