Add setup.py check when passing --jobs and using nmake

Nmake doesn't support -j parameter, yet a user can pass --jobs, and this leads to a build failure without printing any useful information.

Compiling module shiboken2...
Running process in c:\pyside-setup\pyside3_build\py3.6-qt5.11.0-64bit-release\shiboken2: "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\amd64\nmake.exe" -j1
 
error: Error compiling shiboken2

We should exit early the build with a error message that nmake does not support -j.

Also, this is a good test case to see why nmake doesn't give any useful failure info, perhaps stderr is not piped?