[PUSHED] Add casts to reduce javac warning messages

[Stephan Bergmann]

On 06/18/2012 11:41 AM, Noel Grandin wrote:
> This patch removes a few of the javac warning messages i.e. helps to
> reduce noise in the build logs.

Pushed, thanks.  (Followed by some further clean up, while we are at it, 
<http://cgit.freedesktop.org/libreoffice/core/commit/?id=213d5355d78a0a690e366645d6416f4a8fe5e666> 
"Clean up some more.")

Stephan