Qt: Enable fontconfig use. #173

Job	Run time
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Test Ubuntu	3m 59s
Test macOS	5m 39s
Test Windows	5m 11s
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Build Release Web	3m 47s
Build Release Windows (OpenMP) x64	8m 43s
Build Release Windows	7m 41s
Build Release macOS	8m 47s
Build Release Windows (OpenMP)	7m 50s
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	1h 0m 45s

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