checkpolicy/fuzz: Update check_level() to use notdefined field #554

Job	Run time
build (gcc, 3.11, 3.1)	1m 37s
build (gcc, 3.11, 3.1, test-flags-override)	1m 22s
build (gcc, 3.11, 3.1, test-debug)	1m 27s
build (gcc, 3.11, 3.1, linker-bfd)	1m 41s
build (gcc, 3.11, 3.1, linker-gold)	1m 40s
build (gcc, 3.10, 3.1)	1m 36s
build (gcc, 3.9, 3.1)	1m 44s
build (gcc, 3.8, 3.1)	1m 45s
build (gcc, 3.7, 3.1)	1m 44s
build (gcc, pypy3.7, 3.1)	2m 1s
build (gcc, 3.11, 3.0)	1m 32s
build (gcc, 3.11, 2.7)	1m 47s
build (gcc, 3.11, 2.6)	1m 46s
build (gcc, 3.11, 2.5)	1m 49s
build (clang, 3.11, 3.1)	1m 40s
build (clang, 3.11, 3.1, test-flags-override)	1m 39s
build (clang, 3.11, 3.1, test-debug)	1m 31s
build (clang, 3.10, 3.1)	1m 30s
build (clang, 3.9, 3.1)	2m 19s
build (clang, 3.8, 3.1)	1m 47s
build (clang, 3.7, 3.1)	1m 56s
build (clang, pypy3.7, 3.1)	2m 9s
build (clang, 3.11, 3.0)	1m 37s
build (clang, 3.11, 2.7)	2m 0s
build (clang, 3.11, 2.6)	2m 2s
build (clang, 3.11, 2.5)	1m 50s
build (gcc, 3.11, 3.1, sanitizers)	1m 59s
	47m 30s

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