gst/: put reverted patch back in

gst/: put reverted patch back in

Original commit message from CVS:
2004-02-06  Benjamin Otte  <in7y118@public.uni-hamburg.de>

* gst/gstcaps.h:
* gst/gstelement.c: (gst_element_base_class_init),
(gst_element_class_set_details), (gst_element_clear_pad_caps):
* gst/gstpad.c: (gst_pad_link_intersect), (gst_pad_link_fixate),
(gst_pad_try_set_caps), (gst_pad_can_link_filtered),
(gst_real_pad_dispose):
* gst/gststructure.c: (gst_structure_free),
(gst_structure_from_string):
put reverted patch back in
* gst/gstelement.c: (gst_element_remove_pad):
free explicit caps if they're set
* gst/gstpad.c: (_gst_pad_default_fixate_func):
copy the structure when fixating