Removed warnings from ABS

* One deprecation warning with @SuppressWarnings
* Two unused variables. These remain unused even in 4.2.0, see
https://github.com/JakeWharton/ActionBarSherlock/blob/master/library/src/com/actionbarsherlock/internal/widget/IcsLinearLayout.java#L208

This is so we have a workspace without warnings, since these are not
even our warnings.