Circle contour for gencad issue reproduction

gistfile1.txt

$HEADER
GENCAD 1.4
USER ""
DRAWING board-outline.cad
REVISION ""
UNITS USER 1000
ORIGIN 0 0
INTERTRACK 0
$ENDHEADER

$BOARD
THICKNESS 72.000
ARC 100 200   0 100 100 100
ARC 200 100 100 200 100 100
ARC 100   0 200 100 100 100
ARC   0 100 100   0 100 100
$ENDBOARD

$PADS
$ENDPADS

$PADSTACKS
$ENDPADSTACKS

$ARTWORKS
$ENDARTWORKS

$SHAPES
$ENDSHAPES

$COMPONENTS
$ENDCOMPONENTS

$DEVICES
$ENDDEVICES

$SIGNALS
$ENDSIGNALS

$TRACKS
$ENDTRACKS

$LAYERS
$ENDLAYERS

$ROUTES
$ENDROUTES

$MECH
$ENDMECH

$TESTPINS
$ENDTESTPINS

$POWERPINS
$ENDPOWERPINS