Preserve file context and ownership in policy store c9s #137

Job	Run time
build (gcc, 3.11, 3.1)	1m 46s
build (gcc, 3.11, 3.1, test-flags-override)	1m 20s
build (gcc, 3.11, 3.1, test-debug)	1m 30s
build (gcc, 3.11, 3.1, linker-bfd)	1m 33s
build (gcc, 3.11, 3.1, linker-gold)	1m 30s
build (gcc, 3.10, 3.1)	2m 4s
build (gcc, 3.9, 3.1)	1m 36s
build (gcc, 3.8, 3.1)	1m 38s
build (gcc, 3.7, 3.1)	1m 51s
build (gcc, pypy3.7, 3.1)	1m 58s
build (gcc, 3.11, 3.0)	1m 28s
build (gcc, 3.11, 2.7)	1m 46s
build (gcc, 3.11, 2.6)	2m 2s
build (gcc, 3.11, 2.5)	1m 45s
build (clang, 3.11, 3.1)	1m 58s
build (clang, 3.11, 3.1, test-flags-override)	1m 47s
build (clang, 3.11, 3.1, test-debug)	1m 26s
build (clang, 3.10, 3.1)	1m 42s
build (clang, 3.9, 3.1)	2m 46s
build (clang, 3.8, 3.1)	1m 50s
build (clang, 3.7, 3.1)	1m 49s
build (clang, pypy3.7, 3.1)	2m 15s
build (clang, 3.11, 3.0)	1m 38s
build (clang, 3.11, 2.7)	1m 49s
build (clang, 3.11, 2.6)	1m 53s
build (clang, 3.11, 2.5)	1m 51s
build (gcc, 3.11, 3.1, sanitizers)	2m 8s
	48m 39s

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