* error out on autotools failures so warnings are caught early on
* move around AC_CANONICAL_HOST to squash warning
* add AC_CANONICAL_TARGET
* don't squash LIBS but set VORBIS_LIBS instead
* clean up AC_OUTPUT
* AUTOMAKE_OPTIONS = foreign only needs to be done toplevel
  (this can be verified by checking Makefile's generated in other directories
   and seeing that the var isn't used)
* use OGG_LIBS and VORBIS_LIBS in Makefile.am


svn path=/trunk/vorbis/; revision=7345