[PyQt] Problems building PyQt with Python 3.8.1 on Windows

[Boudewijn Rempt]

We've finally found the problem. The main thing was that using -j8 messed
up the generation of the the pyi files; we needed to use -j1. The other
problem was that in our dev envs we had mingw in the path; on the binary
factory not, and that broke the builds on the binary factory because the
C++ dll's couldn't be loaded.

Boudewijn
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