builddeb: Add automatic support for or1k architecture

Signed-off-by: NBen Hutchings <ben@decadent.org.uk>
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>

scripts/package/mkdebian

@@ -61,6 +61,8 @@ set_debarch() {
 			debarch=arm
 		fi
 		;;
+	openrisc)
+		debarch=or1k ;;
 	*)
 		debarch=$(dpkg-architecture -qDEB_HOST_ARCH)
 		echo "" >&2