[Paraview] building qt via paraview-superbuild on macOS 10.12 still fails

[Fabian Wein]

Yesterday qt 5.7.1 was released but I still have issues building qt via pvsb while building qt everywhere manually with the very same configure options just works. 

configuring qt manually results in linker calls like
clang++ -headerpad_max_install_names -stdlib=libc++ -Wl,-syslibroot …

When I verbose the build out of pvsb the options „-headerpad_max_install_names -stdlib=libc++“ are missing. Adding them manually for the single link case, linking works.

I have no idea why the identical configuring from pvsb/cmake leads to different results on macOS 10.12.

I added the details to https://gitlab.kitware.com/paraview/paraview-superbuild/issues/29

Any help is very much appreciated,

Fabian