revert part of the previous commit bringing the removal of

-Wl,--no-undefined back as it does not build otherwise; from Brad

multimedia/xine-lib/patches/patch-m4_attributes_m4

@@ -1,12 +0,0 @@
-$OpenBSD: patch-m4_attributes_m4,v 1.3 2012/08/28 05:54:05 ajacoutot Exp $
---- m4/attributes.m4.orig	Mon Aug 27 19:18:38 2012
-+++ m4/attributes.m4	Mon Aug 27 19:19:42 2012
-@@ -113,7 +113,7 @@ AC_DEFUN([CC_NOUNDEFINED], [
-      dnl MinGW platforms: for libraries required -no-undefined,
-      dnl use it only for libraries in mingw32-w64 
- 
--     *-freebsd* | *-openbsd*) ;;
-+     *-freebsd*) ;;
-      *-mingw* | *-cygwin*)
-         LDFLAGS_NOUNDEFINED="-no-undefined"
-         ;;