Alexei Podtelezhnikov c8d8e15803 Signedness fixes in bitmap presetting.
Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=3514.

* src/raster/ftrend1.c (ft_raster1_render): Exlicitly signed height.
* src/smooth/ftsmooth.c (ft_smooth_render_generic): Ditto.
* src/base/ftobjs.c (ft_glyphslot_preset_bitmap): Explicitly unsigned
subtraction.
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