Fixed compile when no libdc1394 is installed.
Fixed compile when no libdc1394 is installed.

svn path=/trunk/libavg/; revision=4092

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