mapwidgetcontextmenu: use a QtQuick 2.0 import (#583)

[Dirk Hohndel]

> On Sep 16, 2017, at 7:15 AM, Stefan Fuchs <sfuchs at gmx.de> wrote:
> 
> So now it would be nice to know what exactly is needed to build the googlemaps plugin. I'll try to investigate a little bit but I guess to not waste too much time I will end up installing Qt 5.9.1.

I seem to remember that the googlemaps plugin will only compile with Qt 5.6 or later... some change in private data structures or something... but I can't find an email about that, so I'm not 100% sure if I remember this correctly.

/D
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