libselinux: Fix integer comparison issues when compiling for 32-bit #34

Job	Run time
build (gcc, 3.12, 3.3)	1m 32s
build (gcc, 3.12, 3.3, test-flags-override)	1m 23s
build (gcc, 3.12, 3.3, test-debug)	1m 28s
build (gcc, 3.12, 3.3, linker-bfd)	1m 30s
build (gcc, 3.12, 3.3, linker-gold)	1m 30s
build (gcc, 3.11, 3.3)	1m 31s
build (gcc, 3.10, 3.3)	1m 28s
build (gcc, 3.9, 3.3)	1m 32s
build (gcc, 3.8, 3.3)	1m 35s
build (gcc, 3.7, 3.3)	1m 37s
build (gcc, pypy3.7, 3.3)	1m 56s
build (gcc, 3.12, 3.2)	1m 29s
build (gcc, 3.12, 3.1)	2m 30s
build (gcc, 3.12, 3.0)	1m 37s
build (gcc, 3.12, 2.7)	1m 46s
build (gcc, 3.12, 2.6)	1m 46s
build (gcc, 3.12, 2.5)	1m 44s
build (clang, 3.12, 3.3)	1m 55s
build (clang, 3.12, 3.3, test-flags-override)	1m 25s
build (clang, 3.12, 3.3, test-debug)	1m 33s
build (clang, 3.11, 3.3)	1m 41s
build (clang, 3.10, 3.3)	1m 54s
build (clang, 3.9, 3.3)	1m 40s
build (clang, 3.8, 3.3)	1m 42s
build (clang, 3.7, 3.3)	1m 48s
build (clang, pypy3.7, 3.3)	2m 10s
build (clang, 3.12, 3.2)	1m 40s
build (clang, 3.12, 3.1)	1m 39s
build (clang, 3.12, 3.0)	1m 42s
build (clang, 3.12, 2.7)	1m 51s
build (clang, 3.12, 2.6)	1m 51s
build (clang, 3.12, 2.5)	2m 3s
build (gcc, 3.12, 3.3, sanitizers)	2m 3s
	56m 31s

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