Merge change 9605 into donut

* changes:
  use the max image sizes from the target files zip
diff --git a/tools/releasetools/amend_generator.py b/tools/releasetools/amend_generator.py
index 3e8af13..70e71d4 100644
--- a/tools/releasetools/amend_generator.py
+++ b/tools/releasetools/amend_generator.py
@@ -180,6 +180,7 @@
 
   def MakeSymlinks(self, symlink_list):
     """Create symlinks, given a list of (dest, link) pairs."""
+    self.DeleteFiles([i[1] for i in symlink_list])
     self.script.extend(["symlink %s %s" % (i[0], self._FileRoot(i[1]))
                         for i in sorted(symlink_list)])