Fix outermost path detection #4724
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Description
Relates to issue #4719 and googlefonts/fontmake#1093
The code which detects the outermost contour assumed that later paths would be contained within earlier paths, which is of course rubbish. Paths can be in any order they like, so we have to do the O(n^2) thing to find the outermost ones.
Checklist
CHANGELOG.md