WinGui: Remove system info from about window.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5777 b64f7644-9d1e-0410-96f1-a4d463321fa5
WinGui: Remove some unused References 

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5778 b64f7644-9d1e-0410-96f1-a4d463321fa5