libsemanage: open lock_file with O_RDWR #150

Job	Run time
build (gcc, 3.11, 3.1)	22s
build (gcc, 3.11, 3.1, test-flags-override)	1s
build (gcc, 3.11, 3.1, test-debug)	1s
build (gcc, 3.11, 3.1, linker-bfd)	20s
build (gcc, 3.11, 3.1, linker-gold)	13s
build (gcc, 3.10, 3.1)	21s
build (gcc, 3.9, 3.1)	1s
build (gcc, 3.8, 3.1)	1s
build (gcc, 3.7, 3.1)	1s
build (gcc, pypy3.7, 3.1)	1s
build (gcc, 3.11, 3.0)	19s
build (gcc, 3.11, 2.7)	7s
build (gcc, 3.11, 2.6)	8s
build (gcc, 3.11, 2.5)	7s
build (clang, 3.11, 3.1)	21s
build (clang, 3.11, 3.1, test-flags-override)	22s
build (clang, 3.11, 3.1, test-debug)	21s
build (clang, 3.10, 3.1)	21s
build (clang, 3.9, 3.1)	20s
build (clang, 3.8, 3.1)	7s
build (clang, 3.7, 3.1)	4s
build (clang, pypy3.7, 3.1)	8s
build (clang, 3.11, 3.0)	22s
build (clang, 3.11, 2.7)	9s
build (clang, 3.11, 2.6)	10s
build (clang, 3.11, 2.5)	10s
build (gcc, 3.11, 3.1, sanitizers)	1s
	4m 59s

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