When banging ones head against the wall long enough a solutions will present itself 
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When googling on qt, wayland and waylaynd-egl I found 2 pages that helped me.
With these combined I figured out that if I copied the directories wayland-decoration-client, wayland-graphics-integration-client and wayland-shell-integration into the plugins directory and then launched with
LD_LIBRARY_PATH=. QT_QPA_PLATFORM=wayland ./qcad-bin
it all worked in wayland as well, yay.