Fix polygon-based BD-J graphics primitives

Fixes #7
4 jobs from master in 2 minutes and 43 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #258135
debian amd64
build-debian

00:00:48

passed #258136
macos
build-macos

00:01:06

passed #258138
debian amd64 win32
build-win32

00:01:54

passed #258137
debian amd64 win64
build-win64

00:02:00