configure.ac: Remove getbits library. Nothing uses it, and it should be in something...

configure.ac: Remove getbits library.  Nothing uses it, and it should be in something like liboil if someone did want...

Original commit message from CVS:
* configure.ac: Remove getbits library.  Nothing uses it, and
it should be in something like liboil if someone did want
to use it.
* libs/gst/Makefile.am:
* libs/gst/getbits/Makefile.am:
* libs/gst/getbits/gbtest.c:
* libs/gst/getbits/getbits.c:
* libs/gst/getbits/getbits.h:
* libs/gst/getbits/gstgetbits_generic.c:
* libs/gst/getbits/gstgetbits_i386.s:
* libs/gst/getbits/gstgetbits_inl.h: