gst-libs/gst/Makefile.am: Remove idct. It hasn't been used in gst-plugins in a long...

gst-libs/gst/Makefile.am: Remove idct.  It hasn't been used in gst-plugins in a long time, and properly belongs in li...

Original commit message from CVS:
* gst-libs/gst/Makefile.am: Remove idct.  It hasn't been used
in gst-plugins in a long time, and properly belongs in liboil.
* gst-libs/gst/idct/Makefile.am:
* gst-libs/gst/idct/README:
* gst-libs/gst/idct/dct.h:
* gst-libs/gst/idct/doieee:
* gst-libs/gst/idct/fastintidct.c:
* gst-libs/gst/idct/floatidct.c:
* gst-libs/gst/idct/idct.c:
* gst-libs/gst/idct/idct.h:
* gst-libs/gst/idct/idtc.vcproj:
* gst-libs/gst/idct/ieeetest.c:
* gst-libs/gst/idct/intidct.c: