Update to v5.0 kernel headers.

Test: Builds and boots on taimen.
Change-Id: I13843bf1ab30ea89a50852adc88f2cba8401bded
diff --git a/libc/kernel/uapi/drm/drm_mode.h b/libc/kernel/uapi/drm/drm_mode.h
index dff9f34..1944c9c 100644
--- a/libc/kernel/uapi/drm/drm_mode.h
+++ b/libc/kernel/uapi/drm/drm_mode.h
@@ -463,6 +463,12 @@
 struct drm_mode_revoke_lease {
   __u32 lessee_id;
 };
+struct drm_mode_rect {
+  __s32 x1;
+  __s32 y1;
+  __s32 x2;
+  __s32 y2;
+};
 #ifdef __cplusplus
 }
 #endif