WinRT: Creating project via vc template gives warnings

Using qmake -tp vc on a project gives the following warnings:

WARNING: Could not parse Compiler option '-Zc:throwingNew'; added to AdditionalOptions.
WARNING: You can suppress these warnings with CONFIG+=suppress_vcproj_warnings.
WARNING: Could not parse Compiler option '-Zc:throwingNew'; added to AdditionalOptions.

Those should be reflected properly in the options