Update libva headers to the latest release (1.2.1).

third_party/libva/va/drm/va_drm_auth_x11.h

Index: third_party/libva/va/drm/va_drm_auth_x11.h
diff --git a/third_party/libva/va/egl/va_egl_impl.h b/third_party/libva/va/drm/va_drm_auth_x11.h
similarity index 78%
copy from third_party/libva/va/egl/va_egl_impl.h
copy to third_party/libva/va/drm/va_drm_auth_x11.h
index 8b6fb91b9fe112aca7b95f9a07da426b1a4cd97b..530eeed74af6a1c993fce3d5e49fa55f449df4d5 100644
--- a/third_party/libva/va/egl/va_egl_impl.h
+++ b/third_party/libva/va/drm/va_drm_auth_x11.h
@@ -21,19 +21,15 @@
  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
-#ifndef _VA_EGL_IMPL_H_
-#define _VA_EGL_IMPL_H_
 
-#define IMPL_MAX_EGL_SURFACE_TARGETS    4
-#define IMPL_MAX_EGL_SURFACE_ATTRIBUTES 8
+#ifndef VA_DRM_AUTH_X11_H
+#define VA_DRM_AUTH_X11_H
 
+#include <stdint.h>
+#include <stdbool.h>
 
-/**
- * Initialize EGL driver context
- *
- * @param[in]  dpy        the VA Display
- * @return VA_STATUS_SUCCESS if successful
- */
-VAStatus va_egl_init_context(VADisplay dpy);
+DLL_HIDDEN
+bool
+va_drm_authenticate_x11(int fd, uint32_t magic);
 
-#endif /* _VA_GLX_IMPL_H_ */
+#endif /* VA_DRM_AUTH_X11_H */