libsemanage: improve performance of semanage store rebuild #633

Job	Run time
build (gcc, 3.13, 3.3)	1m 42s
build (gcc, 3.13, 3.3, test-flags-override)	1m 25s
build (gcc, 3.13, 3.3, test-debug)	1m 34s
build (gcc, 3.13, 3.3, linker-bfd)	1m 51s
build (gcc, 3.13, 3.3, linker-gold)	1m 44s
build (gcc, 3.12, 3.3)	1m 53s
build (gcc, 3.11, 3.3)	1m 38s
build (gcc, 3.10, 3.3)	1m 58s
build (gcc, 3.9, 3.3)	1m 48s
build (gcc, 3.8, 3.3)	1m 58s
build (gcc, pypy3.7, 3.3)	2m 19s
build (gcc, 3.13, 3.2)	1m 45s
build (gcc, 3.13, 3.1)	1m 50s
build (gcc, 3.13, 3.0)	1m 41s
build (gcc, 3.13, 2.7)	1m 51s
build (gcc, 3.13, 2.6)	2m 0s
build (gcc, 3.13, 2.5)	2m 5s
build (clang, 3.13, 3.3)	1m 43s
build (clang, 3.13, 3.3, test-flags-override)	1m 45s
build (clang, 3.13, 3.3, test-debug)	1m 37s
build (clang, 3.12, 3.3)	1m 44s
build (clang, 3.11, 3.3)	1m 49s
build (clang, 3.10, 3.3)	2m 3s
build (clang, 3.9, 3.3)	1m 49s
build (clang, 3.8, 3.3)	2m 23s
build (clang, pypy3.7, 3.3)	2m 21s
build (clang, 3.13, 3.2)	2m 1s
build (clang, 3.13, 3.1)	1m 56s
build (clang, 3.13, 3.0)	1m 51s
build (clang, 3.13, 2.7)	2m 6s
build (clang, 3.13, 2.6)	2m 4s
build (clang, 3.13, 2.5)	2m 0s
build (gcc, 3.13, 3.3, sanitizers)	1m 59s
	1h 2m 13s

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