Android SDK images to Qt 5.12

[Aleix Pol]

Hey,
By popular demand, I updated our CI tooling to use the new images. Many of
you already tried them.
It's building now as of:
https://build.kde.org/job/Administration/job/Docker%20Generate%20AndroidQt5.12%20SDK

This means that we'll be changing compilers to clang too.

Some builds may fail, help will be welcome. ;)

Thanks!
Aleix
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