am e05628cc: fix signing user builds

Merge commit 'e05628cc8df4ec4b69befa9652d81eb81f0ab008' into eclair

* commit 'e05628cc8df4ec4b69befa9652d81eb81f0ab008':
  fix signing user builds

tools/releasetools/common.py

@@ -145,7 +145,7 @@ def UnzipTemp(filename):
 
   tmp = tempfile.mkdtemp(prefix="targetfiles-")
   OPTIONS.tempfiles.append(tmp)
-  p = Run(["unzip", "-q", filename, "-d", tmp], stdout=subprocess.PIPE)
+  p = Run(["unzip", "-o", "-q", filename, "-d", tmp], stdout=subprocess.PIPE)
   p.communicate()
   if p.returncode != 0:
     raise ExternalError("failed to unzip input target-files \"%s\"" %