Add cygwin to conditional for architectures with no drm

Needed to permit building of GLX extension

---
 mesa/include/GL/internal/dri_interface.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: xorg-git/mesa/include/GL/internal/dri_interface.h
===================================================================
--- xorg-git.orig/mesa/include/GL/internal/dri_interface.h	2008-12-17 21:52:12.968750000 +0000
+++ xorg-git/mesa/include/GL/internal/dri_interface.h	2008-12-17 21:52:39.562500000 +0000
@@ -40,8 +40,8 @@
 #ifndef DRI_INTERFACE_H
 #define DRI_INTERFACE_H
 
-/* Make this something other than __APPLE__ for other arcs with no drm.h */
-#ifndef __APPLE__
+/* For archs with no drm.h */
+#if !defined(__APPLE__) && !defined(__CYGWIN__)
 #include <drm.h>
 #else
 typedef unsigned int drm_context_t;