drm: Add compatibility #ifdefs for *BSD

This let's use use the linux drm headers as the canonical source for
libdrm on all platforms.

Signed-off-by: Kristian Høgsberg <krh@bitplanet.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/include/drm/mga_drm.h b/include/drm/mga_drm.h
index 325fd6f..3ffbc47 100644
--- a/include/drm/mga_drm.h
+++ b/include/drm/mga_drm.h
@@ -35,7 +35,7 @@
 #ifndef __MGA_DRM_H__
 #define __MGA_DRM_H__
 
-#include <linux/types.h>
+#include "drm.h"
 
 /* WARNING: If you change any of these defines, make sure to change the
  * defines in the Xserver file (mga_sarea.h)