usp10: Do glyph translation for truetype fonts only.

[Hans Leidekker]

This version should fix Alexandre's test failure. It passed for me before
though, so I can't verify that.

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Fixes text corruption in Dymola.
See http://bugs.winehq.org/show_bug.cgi?id=10505

 -Hans

Changelog
 Do glyph translation for truetype fonts only.
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