drm: Make drm.h uapi header safe for C++

virtual is a protected keyword in C++ and can't be used at all. Ugh.

This aligns the kernel versions of the drm headers with the ones in
libdrm.

v2: Also annote with __user, as request by Emil&Ilia.

Cc: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459350753-18320-1-git-send-email-daniel.vetter@ffwll.ch
diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index a0ebfe7..7d42d10 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -373,7 +373,11 @@
  */
 struct drm_buf_map {
 	int count;		/**< Length of the buffer list */
+#ifdef __cplusplus
+	void __user *virt;
+#else
 	void __user *virtual;		/**< Mmap'd area in user-virtual */
+#endif
 	struct drm_buf_pub __user *list;	/**< Buffer information */
 };