Bug#1050302: libcoin80c v4.0.0+ds-5 makes Freecad crash

[Tobias Frost]

Documenting a (works for me(tm)) workaround:

Starting freecad with 

freecad -- -platform xcb

avoids the crash.


(It could be that this is a Wayland-only issue, but I cant test that
right now)