use pathconf() to get _PC_CHOWN_RESTRICTED flag #41
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The _PC_* constants are only meaningful in pathconf(); conversely, sysconf() only understands _SC_* constants.
Previously, this code didn't do anything meaningful. For example, on x64 Linux _PC_CHOWN_RESTRICTED is 6, which sysconf() would have interpreted as _SC_TZNAME_MAX (also 6).
Fixes #36.