Update bundled freetype to 2.6.1

third_party/freetype/src/sfnt/Jamfile

Index: third_party/freetype/src/sfnt/Jamfile
diff --git a/third_party/freetype/src/sfnt/Jamfile b/third_party/freetype/src/sfnt/Jamfile
index cb20b1b04b1e5b06ed285a92661d482bf85aea96..cc98d1011ea4522cd71d0b52d58b2bb85b08c98d 100644
--- a/third_party/freetype/src/sfnt/Jamfile
+++ b/third_party/freetype/src/sfnt/Jamfile
@@ -1,6 +1,6 @@
 # FreeType 2 src/sfnt Jamfile
 #
-# Copyright 2001, 2002, 2004, 2005 by
+# Copyright 2001-2015 by
 # David Turner, Robert Wilhelm, and Werner Lemberg.
 #
 # This file is part of the FreeType project, and may only be used, modified,
@@ -16,7 +16,18 @@ SubDir  FT2_TOP $(FT2_SRC_DIR) sfnt ;
 
   if $(FT2_MULTI)
   {
-    _sources = sfobjs sfdriver ttcmap ttmtx ttpost ttload ttsbit ttkern ttbdf sfntpic ;
+    _sources = pngshim
+               sfdriver
+               sfntpic
+               sfobjs
+               ttbdf
+               ttcmap
+               ttkern
+               ttload
+               ttmtx
+               ttpost
+               ttsbit
+               ;
   }
   else
   {