Screen: Fix dv1394src enumeration on 32-Bit systems.

Requires 64-Bit property setting to also work on 32-Bit hosts/builds.

-> Screen for 32-Bit Octave on Linux rebuilt and tested.
-> Video capture/recording movie writing/playback works like a charm.
   Also ROI selection and video resolution setting for cameras, as well
   as different color formats works nicely - execpt format 6, which still
   gives trouble.

-> Video enumeration/capture/recording so far only tested on USB webcam,
   Firewire stuff pending.