f2fs_utils: Add a static libf2fs_sparseblock for minvold
extras: remove su, we have our own

Change-Id: I18e9819efc3e7aed56e4fb19b0fa4f4bf4bd902e
Fix build for static lib and executable

This seems to have been missed in aad1acc

Change-Id: I9973743dbd91dbf29691118a577f2588da8ec403