[Merge] unity:fix-std-tuple-use into unity:master

[Dmitry Shachnev]

The current state is that it fails to build on *all* architectures again:

https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/3336/+build/15741781
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https://code.launchpad.net/~unity-team/unity/+git/unity/+merge/359970
Your team Unity Team is requested to review the proposed merge of unity:fix-std-tuple-use into unity:master.