am 780c2372: accommodate both new and old target-files when creating incrementals (do not merge)

Merge commit '780c2372706c5250079cb7d759f6530691dd9143' into gingerbread-plus-aosp

* commit '780c2372706c5250079cb7d759f6530691dd9143':
  accommodate both new and old target-files when creating incrementals (do not merge)