gst/: get rid of gstmarshal.h dependency. It's not needed.

gst/: get rid of gstmarshal.h dependency. It's not needed.

Original commit message from CVS:
2004-02-03  Benjamin Otte  <in7y118@public.uni-hamburg.de>

* gst/parse/Makefile.am:
* gst/gstobject.h:
get rid of gstmarshal.h dependency. It's not needed.
* gst/gst.h:
* gst/elements/gstfakesink.c:
* gst/elements/gstfakesrc.c:
* gst/elements/gstidentity.c:
* gst/gstbin.c:
* gst/gstelement.c:
* gst/gstindex.c:
* gst/gstobject.c:
* gst/gstpad.c:
* gst/gstthread.c:
* gst/gstxml.c:
* libs/gst/control/dparam.c:
* libs/gst/control/dparammanager.c:
include gstmarshal.h.
Fixes #132045