Some of the tests relies on having them there, for example verifying
that certain icons is not null or clicking on a widget that has some
size based upon the icons inside them.
It's desktop unless you're building for Android where the default it's
mobile.
You can still manually specify which UI you want and you'll get that
regardless of the platform
Only require KParts if we're building the desktop UI
Two small changes in CI:
* Stop pretending we have a macOS CI
* Add Android CI
- libkexiv2, khtml and kjs would be nice but we don't have Android builds
yet