Use platform path for renaming file in util.atomictempfile.rename()

mercurial/util.py

@@ -734,7 +734,7 b' def opener(base, audit=True):'
         def rename(self):
             if not self.closed:
                 posixfile.close(self)
-                rename(self.temp, self.__name)
+                rename(self.temp, localpath(self.__name))
         def __del__(self):
             if not self.closed:
                 try: