Android Things Cube R2 Release
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Merge changes I3ec14f04,If580b968,I54c05549,Ia9ddbaf6,Ibce07e5d

* changes:
  Merge remote-tracking branch 'toybox/master' into HEAD
  Convert more option vars to the new (single letter) coding style.
  Trivial cleanup of uniq.c.
  Discard harmless error messages.
  Update news.html for 0.7.8 release.