catalyst-auto: Build only 64-bit userland on ppc64 and remove '64ul'

tools/catalyst-auto-ppc64.conf

@@ -39,7 +39,7 @@ update_symlinks() {
 	local d f t
 	for d in "${BUILD_SRCDIR_BASE}/builds/default/ppc64" ; do
 		pushd "${d}" >/dev/null
-		for t in ppc64-64ul ppc64-32ul; do
+		for t in ppc64; do
 			for f in $(ls stage3-${t}-*bz2 | grep -v latest | give_latest_from_dates) ; do
 				local of=$(echo "${f}" | convert_filename)
 				ln -sf "${f}" "${of}"