Update freetype sources (2.6.2) in third party.

third_party/freetype2/src/src/truetype/ttdriver.h

Index: third_party/freetype2/src/src/truetype/ttdriver.h
diff --git a/third_party/freetype2/src/src/truetype/ttdriver.h b/third_party/freetype2/src/src/truetype/ttdriver.h
new file mode 100644
index 0000000000000000000000000000000000000000..6cacd60966e7e695c2c66130f1d0b9eb00f08699
--- /dev/null
+++ b/third_party/freetype2/src/src/truetype/ttdriver.h
@@ -0,0 +1,38 @@
+/***************************************************************************/
+/*                                                                         */
+/*  ttdriver.h                                                             */
+/*                                                                         */
+/*    High-level TrueType driver interface (specification).                */
+/*                                                                         */
+/*  Copyright 1996-2015 by                                                 */
+/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
+/*                                                                         */
+/*  This file is part of the FreeType project, and may only be used,       */
+/*  modified, and distributed under the terms of the FreeType project      */
+/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
+/*  this file you indicate that you have read the license and              */
+/*  understand and accept it fully.                                        */
+/*                                                                         */
+/***************************************************************************/
+
+
+#ifndef __TTDRIVER_H__
+#define __TTDRIVER_H__
+
+
+#include <ft2build.h>
+#include FT_INTERNAL_DRIVER_H
+
+
+FT_BEGIN_HEADER
+
+
+  FT_DECLARE_DRIVER( tt_driver_class )
+
+
+FT_END_HEADER
+
+#endif /* __TTDRIVER_H__ */
+
+
+/* END */