TT_CONFIG_OPTION_SUBPIXEL_HINTING for freetype2 port

[Andrey Chernov]

Hi, please consider adding -DTT_CONFIG_OPTION_SUBPIXEL_HINTING to
LCD_FILTERING_CFLAGS in the freetype2 Makefile as it provide better
visual results.
(see include/config/ftoption.h)

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