am c048c9b5: default empty tapas to TARGET_BUILD_APPS "all"

Merge commit 'c048c9b598b36dc7506a954cc0d3d80f308b1b13' into gingerbread

* commit 'c048c9b598b36dc7506a954cc0d3d80f308b1b13':
  default empty tapas to TARGET_BUILD_APPS "all"