Add some Debian/Ubuntu/Kubuntu dependencies to build Qt

When building Qt, that error can be avoided installing the "libcups2-dev" package:

-- Build files have been written to: /home/user/kde/build/qtbase
ninja: error: '/usr/lib/x86_64-linux-gnu/libcups.so', needed by 'plugins/printsupport/libcupsprintersupport.so', missing and no known rule to make it

When building Qt, that error can be avoided installing the "libva-dev" package:

/home/user/kde/src/qtmultimedia/src/plugins/multimedia/ffmpeg/qffmpegencoderoptions.cpp:6:10: fatal error: va/va.h: No such file or directory