meta/lib/oe/patch.py: do not leave .orig files if a patch isn't perfectly matching

Particularly, this was causing 'devtool modify' to erroneously add those
.orig files into commits. This was getting in the way, if the goal
was to amend/update those existing patches.

(From OE-Core rev: f4f3406c3bd9599d7a19275475d52bda4c42f2ab)

Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/patch.py

@@ -212,7 +212,7 @@ class PatchTree(PatchSet):
         self.patches.insert(i, patch)
 
     def _applypatch(self, patch, force = False, reverse = False, run = True):
-        shellcmd = ["cat", patch['file'], "|", "patch", "-p", patch['strippath']]
+        shellcmd = ["cat", patch['file'], "|", "patch", "--no-backup-if-mismatch", "-p", patch['strippath']]
         if reverse:
             shellcmd.append('-R')