[Merge] lp:~artmello/qtubuntu/qtubuntu-new_mir_api into lp:qtubuntu

[Daniel d'Andrada]

> In makeSurfaceSpec (src/ubuntumirclient/qmirclientwindow.cpp) you're no longer
> applying the specified pixel format.
> 
> To do so, add this call after the switch (type) {}:
> 
> mir_window_spec_set_pixel_format(spec.get(), pixelFormat);

And then remove this code:

"""
#if MIR_CLIENT_VERSION >= MIR_VERSION_NUMBER(3, 4, 0)
    Q_UNUSED(pixelFormat);
#endif
"""
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https://code.launchpad.net/~artmello/qtubuntu/qtubuntu-new_mir_api/+merge/316577
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