[Interest] Prevent tabbing of Qt application on macOS Sierra

[Jake Petroules]

> On Dec 2, 2017, at 12:48 PM, Thiago Macieira <thiago.macieira at intel.com> wrote:
> 
> On Saturday, 2 December 2017 11:50:01 PST Jake Petroules wrote:
>> Actually, you shouldn't do this. Instead, use this:
>> 
>> #include <QtCore/qglobal_p.h> // includes an implementation of
>> __builtin_available for compilers older than Xcode 9
> 
> Do not do this.

This was mostly for illustration. OK, let me reformulate... don't actually include Qt private headers, but add an equivalent of the __builtin_available shim in your own codebase if you need to build with Xcode older than 9.

See https://codereview.qt-project.org/#/c/206346/

> 
> -- 
> Thiago Macieira - thiago.macieira (AT) intel.com
>  Software Architect - Intel Open Source Technology Center
> 
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-- 
Jake Petroules - jake.petroules at qt.io
The Qt Company - Silicon Valley
Qbs build tool evangelist - qbs.io