WinGui: Minor interop update.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6212 b64f7644-9d1e-0410-96f1-a4d463321fa5
WinGui: Missing file from last checkin.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6213 b64f7644-9d1e-0410-96f1-a4d463321fa5