[Fontconfig] Don't do font fallback for PUA chars?

[Behdad Esfahbod]

Hey,

Triggered by a Chrome bug:

  https://chromium-review.googlesource.com/c/chromium/src/+/829378

Since PUA has no meaning outside of a specified font, I think we should
exclude that range from either a font's charset, or ignore it during
FcFontSort().

Thoughts?

-- 
behdad
http://behdad.org/
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