[HarfBuzz] Glyphs with negative advance width

[Olivier Berten]

Hi!

Although it isn't complying with the TrueType/OpenType specifications,
some fonts have some glyphs with negative advance width.

Advance width (in htmx) is defined as USHORT/uint16 but it seems
everybody else reads it as SHORT/int16.

In the attached font, glyph "uni17b7" (khmer character  ិ) has a
negative advance width. You can try it with the string និងសមភាព

I wouldn't call this a bug in harfbuzz since it's a font bug but for
compatibility reasons, it might be useful to change it...

Olivier
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