PrintObject.cpp references tbb::spin_mutex, thus it needs to include
tbb/spin_mutex. Otherwise compilation fails with:
error: ‘spin_mutex’ is not a member of ‘tbb’
Supersedes #7057
* Patch wxWidgets to automatically select dark theme variant (taken from
Bambu slicer flatpak manifest)
* Drop python script that selected dark theme
* Add a patch to fix libslic3r build