checkpolicy: Check the right bits of an ibpkeycon rule subnet prefix #581

Job	Run time
build (gcc, 3.12, 3.3)	1m 31s
build (gcc, 3.12, 3.3, test-flags-override)	1m 20s
build (gcc, 3.12, 3.3, test-debug)	1m 30s
build (gcc, 3.12, 3.3, linker-bfd)	1m 33s
build (gcc, 3.12, 3.3, linker-gold)	1m 29s
build (gcc, 3.11, 3.3)	1m 27s
build (gcc, 3.10, 3.3)	1m 38s
build (gcc, 3.9, 3.3)	1m 36s
build (gcc, 3.8, 3.3)	1m 34s
build (gcc, 3.7, 3.3)	1m 39s
build (gcc, pypy3.7, 3.3)	2m 13s
build (gcc, 3.12, 3.2)	1m 34s
build (gcc, 3.12, 3.1)	1m 43s
build (gcc, 3.12, 3.0)	1m 37s
build (gcc, 3.12, 2.7)	1m 49s
build (gcc, 3.12, 2.6)	1m 42s
build (gcc, 3.12, 2.5)	1m 48s
build (clang, 3.12, 3.3)	1m 33s
build (clang, 3.12, 3.3, test-flags-override)	1m 26s
build (clang, 3.12, 3.3, test-debug)	1m 26s
build (clang, 3.11, 3.3)	1m 53s
build (clang, 3.10, 3.3)	1m 34s
build (clang, 3.9, 3.3)	1m 42s
build (clang, 3.8, 3.3)	1m 47s
build (clang, 3.7, 3.3)	1m 54s
build (clang, pypy3.7, 3.3)	2m 0s
build (clang, 3.12, 3.2)	1m 34s
build (clang, 3.12, 3.1)	2m 0s
build (clang, 3.12, 3.0)	1m 47s
build (clang, 3.12, 2.7)	1m 55s
build (clang, 3.12, 2.6)	1m 51s
build (clang, 3.12, 2.5)	1m 48s
build (gcc, 3.12, 3.3, sanitizers)	2m 6s
	55m 59s

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