[Development] Q_COMPILER_VARIADIC_TEMPLATES since Qt 5.7

[Alexander Blasche]

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From: Development <development-bounces+alexander.blasche=qt.io at qt-project.org> on behalf of Thiago Macieira 

>QOverload could be used, but I'd rather you didn't use it in the Qt sources.
>It's a bit ugly.

Currently not all Qt compilers work with it which makes it a no go for Qt itself. I had to remove it again:

https://bugreports.qt.io/browse/QTBUG-55747

--
Alex