[Qt-creator] MSVC: Fix Microsoft Visual Cpp Build Tools - not working for MSVC2015

[Epting, Thomas]

> We found that the change below is not working correctly for MSVC2015 (VC14).
> http://code.qt.io/cgit/qt-creator/qt-creator.git/commit/?h=4.0&id=2be4
> d2643a4ffc8a6c14197a943bcd6694d4f015

Should be fixed in next snapshots (https://codereview.qt-project.org/161554)

Thank you!

Best regards,
Thomas