am e1b710a5: merge from open-source master

Merge commit 'e1b710a5ba16be660d5383f1e56bd76b664b1d05'

* commit 'e1b710a5ba16be660d5383f1e56bd76b664b1d05':
  Added prune options to findleaves.sh to ignore the .git and .repo
  Added a default to specify an alternative tool chain prefix if needed.
  Update prelink map for libFLAC