Fixed DirectShow camera support for at least one cheap USB webcam.
Fixed DirectShow camera support for at least one cheap USB webcam.

svn path=/trunk/libavg/; revision=5681

yyd01245/libavg,th3infinity/libavg,scotty007/libavg,scotty007/libavg,th3infinity/libavg,th3infinity/libavg,hoodie/libavg,libavg/libavg,hoodie/libavg,libavg/libavg,hoodie/libavg,libavg/libavg,yyd01245/libavg,hoodie/libavg,th3infinity/libavg,libavg/libavg,scotty007/libavg,yyd01245/libavg,yyd01245/libavg,scotty007/libavg