libsepol: constify function pointer arrays #562

Job	Run time
build (gcc, 3.11, 3.1)	1m 37s
build (gcc, 3.11, 3.1, test-flags-override)	1m 18s
build (gcc, 3.11, 3.1, test-debug)	1m 24s
build (gcc, 3.11, 3.1, linker-bfd)	1m 34s
build (gcc, 3.11, 3.1, linker-gold)	1m 31s
build (gcc, 3.10, 3.1)	1m 32s
build (gcc, 3.9, 3.1)	1m 32s
build (gcc, 3.8, 3.1)	1m 34s
build (gcc, 3.7, 3.1)	1m 36s
build (gcc, pypy3.7, 3.1)	3m 0s
build (gcc, 3.11, 3.0)	1m 37s
build (gcc, 3.11, 2.7)	2m 28s
build (gcc, 3.11, 2.6)	1m 46s
build (gcc, 3.11, 2.5)	1m 47s
build (clang, 3.11, 3.1)	1m 35s
build (clang, 3.11, 3.1, test-flags-override)	1m 22s
build (clang, 3.11, 3.1, test-debug)	1m 34s
build (clang, 3.10, 3.1)	1m 43s
build (clang, 3.9, 3.1)	2m 29s
build (clang, 3.8, 3.1)	2m 2s
build (clang, 3.7, 3.1)	1m 58s
build (clang, pypy3.7, 3.1)	2m 5s
build (clang, 3.11, 3.0)	2m 5s
build (clang, 3.11, 2.7)	1m 57s
build (clang, 3.11, 2.6)	2m 0s
build (clang, 3.11, 2.5)	2m 12s
build (gcc, 3.11, 3.1, sanitizers)	2m 49s
	50m 7s

Provide feedback