sys/ximage/ximagesink.c: Adding synchronous property for debugging.

sys/ximage/ximagesink.c: Adding synchronous property for debugging.

Original commit message from CVS:
2004-01-18  Julien MOUTTE  <julien@moutte.net>

* sys/ximage/ximagesink.c: (gst_ximagesink_set_property),
(gst_ximagesink_get_property), (gst_ximagesink_class_init): Adding
synchronous property for debugging.
* sys/ximage/ximagesink.h: Adding the synchronous boolean flag.
* sys/xvimage/xvimagesink.c: (gst_xvimagesink_xcontext_get),
(gst_xvimagesink_set_property): Moving a pointer declaration to a
smaller block, fixing indent.