Add Cairo patch to make FT_LCD_FILTER_DEFAULT the actual default lcdfilter

[0xBRM]

https://github.com/CrisBRM/fontconfig-ultimate/blob/master/cairo/cairo-lcdfilter-make-default-default.patch

FT_LCD_FILTER_LEGACY is completely useless and introduces excessive colour fringes.

[bohoomil]

Thanks -- done.