Revert "Build Cython in parallel on appveyor if distutils support it."
Revert "Build Cython in parallel on appveyor if distutils support it."

This reverts commit 52635828ba8eaae0ddf8db43b47822997de91ae1.

multiprocessing requires some additional setup on Windows, which I don't currently want to implement in setup.py.

cython/cython,scoder/cython,da-woods/cython,scoder/cython,cython/cython,scoder/cython,da-woods/cython,da-woods/cython,cython/cython,scoder/cython,da-woods/cython,cython/cython