am b1c272a6: Do a full clean build because of the installclean improvement steps

Merge commit 'b1c272a670936322db5200d888ea8558eb266d6e' into gingerbread-plus-aosp

* commit 'b1c272a670936322db5200d888ea8558eb266d6e':
  Do a full clean build because of the installclean improvement steps