[MERGE] Stop treating Permission Denied as lock contention

[Aaron Bentley]

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John Arbash Meinel wrote:

> But as near as I can tell, you can't make a directory readonly on Win32.

If we can't make a readonly directory (in terms of POSIX semantics) on
Win32, perhaps we should make "make_readonly" on win32 raise
UnsupportedOperation for directories.

Aaron
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