[Merge] lp:~albaguirre/qtubuntu/use-mir-rs-api into lp:qtubuntu

[Alberto Aguirre]

> Looks mostly sensible, but I need to get more familiar with qtubuntu to be
> sure.
> 
> Can we aim to land lp:~alan-griffiths/mir/deprecation-macros and use
> -DMIR_DEPRECATE_RENDERSURFACES=0 - or building against trunk Mir an issue?

Shouldn't be an issue on a local machine, but qtubuntu's CI would be.
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https://code.launchpad.net/~albaguirre/qtubuntu/use-mir-rs-api/+merge/321627
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