[ft] Enabling Subpixel Rendering On freetype-2.7.1

[Gordon Dickens]

   Hello,
   I have successfully been enabling subpixel Rendering on previous
   versions of freetype2, most recently with version 2.6.3, with a patch
   that sets the following in ftoption.h:
   #define FT_CONFIG_OPTION_SUBPIXEL_RENDERING
   However, when I upgrade to freetype-2.7.1, then the rendering is not
   the same and it doesn't look nearly as good.
   Are there other parameters that need changing or am I doing something
   wrong?
   Thanks!
   Gordon