check/gst-libs/controller.c: Header include fix.

check/gst-libs/controller.c: Header include fix.

Original commit message from CVS:
* check/gst-libs/controller.c:
Header include fix.
* gst/base/gstbasetransform.c:
(gst_base_transform_default_prepare_buf),
(gst_base_transform_handle_buffer):
* gst/base/gstbasetransform.h:
Some more basetransform changes and fixes to enable sub-classes
that modify buffer metadata only.
* gst/elements/gstcapsfilter.c: (gst_capsfilter_class_init),
(gst_capsfilter_init), (gst_capsfilter_transform_ip),
(gst_capsfilter_prepare_buf):
If the output pad has fixed allowed caps and input buffers
don't have any, set the fixed caps on outgoing buffers.