Mac test build based on Qt5.11.1 - please test

[Dirk Hohndel]

> On Jul 7, 2018, at 7:03 AM, Dirk Hohndel <dirk at hohndel.org> wrote:
>> Connecting to facebook causes a crash. Attached is a log from that crash. Tested a few times, from different screens and same result.
> I created an issue for this: https://github.com/Subsurface-divelog/subsurface/issues/1471 <https://github.com/Subsurface-divelog/subsurface/issues/1471>	

For those not following along on GitHub, it turns out Subsurface 4.8.0 on Mac built with Qt5.10.1 already crashes with Facebook. The fact that we haven't received a user bug report might indicate how rarely this feature is used... :-(

/D
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