usp10: Implement ScriptStringGetLogicalWidths.

[Hans Leidekker]

This is a rediffed version of Clinton Stimpsons patch to make it
apply after my patch set, specifically after the patch named
"usp10: Fix all failing tests on Windows and Wine".

 -Hans

Changelog
  Clinton Stimpson <cjstimpson at utwire.net>
  usp10: Implement ScriptStringGetLogicalWidths.
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