plugins/elements/gstcapsfilter.c: The caps intersection algorithm can produce multipl...

plugins/elements/gstcapsfilter.c: The caps intersection algorithm can produce multiple copies of the caps. Until that...

Original commit message from CVS:
* plugins/elements/gstcapsfilter.c: (gst_capsfilter_prepare_buf):
The caps intersection algorithm can produce multiple copies of the
caps. Until that is fixed, we need to simplify the result to be
sure whether the allowed caps are fixed or not.
* plugins/elements/gstqueue.c: (gst_queue_init),
(gst_queue_bufferalloc), (gst_queue_acceptcaps),
(gst_queue_push_one):
Proxied buffer alloc should not set the caps on the source pad.
When pushing buffers, we always accept the caps change that triggers.
This prevents negotiation errors caused by caps changing mid-stream
and then being refused on our source pad (because upstream is now
refusing those caps).