[PyQt] Segfault with PyQt 5.10.1 and Cura

[Jelle van der Waa]

Updating our PyQt 5 packages in Arch Linux, made Cura segfault. With the
following backtrace. [1]

After some manually diffing and some trial and error (why is there no
public Git repo?!). I've found that reverting the following change fixes
the segfault introduced in 5.10.1.

I'm not sure what caused it or how to reproduce it without running cura.
But can test out reproducers if needed.

[1] https://paste.kde.org/pvk28xuhr
[2] http://pkgbuild.com/~jelle/0001-Revert-register-type-magic.patch

-- 
Jelle van der Waa