[Fontconfig] FcFontSetMatch doesn't produce the same result as FcFontSetSort

[Keith Packard]

I prefer japanese han glyphs over chinese when loading untagged content,
so I set fontconfig to use lang=en,ja when no language is otherwise
specified.

With the optimized FcFontSetMatch, this eliminates all fonts which don't
support Japanese from matching; not the desired result at all.

In any case, the requirement here is that FcFontSetMatch produce the
font at the head of the list produced by FcFontSetSort; the case above
should be easily tested with:

 $ fc-match sans:lang=en,ja

vs

 $ fc-match --sort sans:lang=en,ja | head -1

-- 
keith.packard at intel.com
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