EndType enum order is wrong

[plut]

From clipper.hpp:

enum EndType {etClosedPolygon, etClosedLine, etOpenButt, etOpenSquare, etOpenRound};

And from Clipper.jl:

@enum EndType EndTypeClosedPolygon = 0 EndTypeClosedLine = 1 EndTypeOpenSquare = 2 EndTypeOpenRound = 3 EndTypeOpenButt = 4

(butt, square, round) are cyclically permuted.