gst/goom/Makefile.am: Remove the warnings being disabled, fix linkage on x86, spotted by Sebastian Dröge

Original commit message from CVS:
* gst/goom/Makefile.am: Remove the warnings being disabled,
fix linkage on x86, spotted by Sebastian Dröge
<slomo@circular-chaos.org>

* gst/goom/convolve_fx.c (convolve_init),
(create_output_with_brightness), (convolve_apply):
* gst/goom/filters.c (zoomFilterVisualFXWrapper_create):
* gst/goom/goomsl.c:
* gst/goom/ifs.c (ifs_update), (ifs_visualfx_create):
* gst/goom/plugin_info.c:
* gst/goom/tentacle3d.c (tentacle_fx_create):
Fix warnings, and disable the motifs in the convolve_fx
plugin (they were causing warnings, and they were just
"Goom" in funny letterring)