[HarfBuzz] Funny effect of fallback mark positioning

[Khaled Hosny]

Hi Behdad,

When (accidentally) testing fonts that has no OpenType tables with
vocalized Arabic text, the fallback glyph positioning gives a funny
Tetris-like patterns. I like it :) but may be HarfBuzz should give up on
fallback positioning if the mark will end up as .notdef.

See the attached image using a special version of Libertine:
http://khaledhosny.org/files/tmp/libertine_r-noot.otf

Regards,
Khaled
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