libs/gst/check/gstcheck.*: Make the declaration in the header for gst_check_element_push_buffer_list match the implem...

Original commit message from CVS:
* libs/gst/check/gstcheck.c: (gst_check_drop_buffers),
(gst_check_element_push_buffer_list):
* libs/gst/check/gstcheck.h:
Make the declaration in the header for
gst_check_element_push_buffer_list match the implementation.
Fix up spelling, grammar and wording of the documentation in a few
places, and add the Since keyword to new API functions.
Use g_list_delete_link instead of g_list_remove in
gst_check_drop_buffers, since it's immeasurably more efficient.
* tests/check/elements/fakesrc.c: (GST_START_TEST):
Use new gst_check_drop_buffers function where appropriate.
* win32/common/libgstbase.def:
* win32/common/libgstreamer.def:
Add new symbols gst_collect_pads_take_buffer,
gst_collect_pads_read_buffer, gst_index_set_resolver_full to the
exports
Changelog surgery to add API keyword to new gst_check API.