gdi32: Implement GetFontUnicodeRanges.

[Hans Leidekker]

Finally, I found a working approach based on freetype's
FT_Get_{First,Next}_Char. A test with arial.ttf from win2k3
now shows 100% matching output.

See  http://bugs.winehq.org/show_bug.cgi?id=5865
     http://bugs.winehq.org/show_bug.cgi?id=6536

 -Hans

Changelog
  Implement GetFontUnicodeRanges.
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