Sascha Brawer 624b2b7529 [GX] In ‘gvar’ tuples, treat (0,0) different from unspecified entries
After this change, MacOS Yosemite 10.3.3 renders the Oslash glyph
of Skia.ttf with the exact same outline before and after round-tripping
the font through TTX.  Before this change, the outlines were slightly
different after round-tripping through TTX.

In my initial reading of the “gvar” specification, I had assumed
that (0,0) entries had no significance. However, that is not
how the current MacOS implementation interprets it.
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