builddeb: Add automatic support for or1k architecture

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/scripts/package/mkdebian b/scripts/package/mkdebian
index 83179a4..fb0d3056 100755
--- a/scripts/package/mkdebian
+++ b/scripts/package/mkdebian
@@ -61,6 +61,8 @@
 			debarch=arm
 		fi
 		;;
+	openrisc)
+		debarch=or1k ;;
 	*)
 		debarch=$(dpkg-architecture -qDEB_HOST_ARCH)
 		echo "" >&2