Remove ActionBarSherlock from android

3195c6d removed the only use of ActionBarSherlock, but did not stop it
from being built. This causes the build to fail in abs-lib due to the missing
v4 support library.
Stop building abs-lib and remove the no-longer used code.

Change-Id: Ib9dd4b4b95d64ef251eaf8d4b24e539be9d855ff
Reviewed-on: https://gerrit.libreoffice.org/11421
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Tested-by: Tomaž Vajngerl <quikee@gmail.com>