FreeType 2.6.4 released with new and better bytecode interpreter

The new interpreter has absolutely improved rendering of fonts, at least subjectively for me.

    CHANGES BETWEEN 2.6.3 and 2.6.4

    I. IMPORTANT CHANGES

        - A new  subpixel hinting  mode has  been contributed  by Nikolaus
        Waxweiler, which is now the  default rendering mode for TrueType
        fonts.  It implements  (almost everything of) version  40 of the
        bytecode engine.

        The existing code  base in FreeType (the  `Infinality code') was
        stripped to the bare minimum  and all configurability removed in
        the  name  of speed  and  simplicity.   The configurability  was
        mainly aimed  at legacy  fonts like Arial,  Times New  Roman, or
        Courier.  [Legacy fonts are fonts  that modify vertical stems to
        achieve clean black-and-white bitmaps.]  The new mode focuses on
        applying a minimal set of rules to all fonts indiscriminately so
        that modern and web fonts  render well while legacy fonts render
        okay.

        Activation  of the  subpixel hinting  support can  be controlled
        with   the   `TT_CONFIG_OPTION_SUBPIXEL_HINTING'   configuration
        option  at compile  time: If  set to  value 1,  you get  the old
        Infinality  mode  (which  was  never  the  default  due  to  its
        slowness).  Value 2 activates the new subpixel hinting mode, and
        value 3 activates both.  The default is value 2.

        At run time,  you can select the subpixel hinting  mode with the
        `interpreter-version'  property (provided  you have  compiled in
        the corresponding hinting mode); see `ftttdrv.h' for more.