[PATH] fix broken mac build on old clangs.

[Thiago Macieira]

On Tuesday 10 November 2015 00:10:15 Lubomir I. Ivanov wrote:
> constexpr specifically seems to have landed in msvc 2015 RTM.
> http://blogs.msdn.com/b/vcblog/archive/2015/06/02/constexpr-complete-for-vs-> 2015-rtm-c-11-compiler-c-17-stl.aspx

Yeah, but it doesn't work. If you try Qt's tst_compiler test for constexpr, it 
fails.

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Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center
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