intel: Add a forward declaration of struct drm_clip_rect

... so that intel_bufmgr.h can be compiled standalone.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/intel/intel_bufmgr.h b/intel/intel_bufmgr.h
index 9df5168..e1b4c45 100644
--- a/intel/intel_bufmgr.h
+++ b/intel/intel_bufmgr.h
@@ -36,6 +36,8 @@
 
 #include <stdint.h>
 
+struct drm_clip_rect;
+
 typedef struct _drm_intel_bufmgr drm_intel_bufmgr;
 typedef struct _drm_intel_bo drm_intel_bo;
 
@@ -109,9 +111,9 @@
 void drm_intel_bufmgr_set_debug(drm_intel_bufmgr *bufmgr, int enable_debug);
 void drm_intel_bufmgr_destroy(drm_intel_bufmgr *bufmgr);
 int drm_intel_bo_exec(drm_intel_bo *bo, int used,
-		      drm_clip_rect_t * cliprects, int num_cliprects, int DR4);
+		      struct drm_clip_rect *cliprects, int num_cliprects, int DR4);
 int drm_intel_bo_mrb_exec(drm_intel_bo *bo, int used,
-			drm_clip_rect_t *cliprects, int num_cliprects, int DR4,
+			struct drm_clip_rect *cliprects, int num_cliprects, int DR4,
 			int ring_flag);
 int drm_intel_bufmgr_check_aperture_space(drm_intel_bo ** bo_array, int count);