Bug#860789: freecad: import of openscad file turns "differences" into "unions"

[Tobias Frost]

Control: fixed -1 0.21.2+dfsg1-1
Control: close -1

(Accoring to the upstream isue, this has been fixed after 0.20.
The first version in Debian containing the fix is 0.21.2+dsgf-1

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tobi