Update to kernel headers v4.12.3.

Test: Built angler.
Change-Id: Icbcf4fac2334de8409b049ed7a3b4c24b4e98ce9
diff --git a/libc/kernel/uapi/drm/vmwgfx_drm.h b/libc/kernel/uapi/drm/vmwgfx_drm.h
index a9e6952..2b7e0fe 100644
--- a/libc/kernel/uapi/drm/vmwgfx_drm.h
+++ b/libc/kernel/uapi/drm/vmwgfx_drm.h
@@ -26,6 +26,7 @@
 #define DRM_VMW_GET_PARAM 0
 #define DRM_VMW_ALLOC_DMABUF 1
 #define DRM_VMW_UNREF_DMABUF 2
+#define DRM_VMW_HANDLE_CLOSE 2
 #define DRM_VMW_CURSOR_BYPASS 3
 #define DRM_VMW_CONTROL_STREAM 4
 #define DRM_VMW_CLAIM_STREAM 5
@@ -314,6 +315,10 @@
   enum drm_vmw_extended_context req;
   struct drm_vmw_context_arg rep;
 };
+struct drm_vmw_handle_close_arg {
+  __u32 handle;
+  __u32 pad64;
+};
 #ifdef __cplusplus
 #endif
 #endif