[PATCH 6 of 6 V1] opener: use util.unlink (issue2524)

[Adrian Buehlmann]

# HG changeset patch
# User Adrian Buehlmann <adrian at cadifra.com>
# Date 1294751416 -3600
# Node ID a595780a2600f7aefdb74f909704c28247fda9e6
# Parent  883a56de3fe6ae2ccb5eed130c07c5a03e51710c
opener: use util.unlink (issue2524)

diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -911,7 +911,7 @@ class opener(object):
                 return atomictempfile(f, mode, self.createmode)
             try:
                 if 'w' in mode:
-                    os.unlink(f)
+                    unlink(f)
                     nlink = 0
                 else:
                     # nlinks() may behave differently for files on Windows