Software X renderer is stated to be not supported on x86_64, but it
builds fine. For now just reenable it, to be in sync with i386, so we
don't need to disable the x86_64 package.

--- Makefile.orig	2007-10-28 21:40:01.000000000 -0200
+++ Makefile	2007-10-28 21:40:27.000000000 -0200
@@ -339,8 +339,8 @@ ifeq ($(ARCH),x86_64)
   $(warning Warning: SVGA not supported for $(ARCH))
  endif
 
- ifeq ($(strip $(BUILD_SOFTX)),YES)
-  $(warning Warning: Software X Renderer not supported for $(ARCH))
+ ifeq ($(strip $(BUILD_X11)),YES)
+  TARGETS += $(BUILDDIR)/ref_softx.$(SHLIBEXT)
  endif
 
  ifeq ($(strip $(BUILD_GLX)),YES)