[PATCH] Windows rename failures

Log:

Windows rename (MoveFileEx) operations will sometimes fail with
'Access Denied' when it should not -- it appears to be a race/bug
in MoveFileEx or NTFS somewhere. A short sleep and retrying the
operation finishes correctly. See the dev archives for more
information (search for MoveFileEx and/or Access Denied).

* subversion/libsvn_subr/io.c
  (svn_io_file_rename): Add a short sleep and retry if the rename
  fails in Windows with 'Access Denied.'

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