[ft-devel] move band check outside of the loop.

[Alexei Podtelezhnikov]

This patch is a trivial move of band check out of the loop in the
cubic flattener.
The arcs resulting from any split are always smaller than the original.
If the original is inside the band, the children are inside by definition,
so there is no need to loop this rather long check.

I am working on similar optimization for conic too. What would you suggest as
a proper benchmark here?

freetype-2.4.5-ftgrays.patch
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