Update freetype to 2.5.4.

third_party/freetype/src/smooth/Jamfile

 # FreeType 2 src/smooth Jamfile
 #
 # Copyright 2001 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.
 
 SubDir  FT2_TOP $(FT2_SRC_DIR) smooth ;
 
 {
   local  _sources ;
 
   if $(FT2_MULTI)
   {
     _sources = ftgrays ftsmooth ftspic ;
   }
   else
   {
     _sources = smooth ;
   }
 
   Library  $(FT2_LIB) : $(_sources).c ;
 }
 
 # end of src/smooth Jamfile