Shiboken2 can't be imported on Windows8.1, Python3.7.3

Hey,

when using windows 8.1 64bit, and python3.7.3, installing shiboken2==5.12.2 from pypi will end up in a failing module import. This interestingly only applies to the said pairing, it works on windows 10 and windows 7 64 bit. I use virtual machines to test, and the only one it fails on is windows8.1.

I already reviewed https://wiki.qt.io/Qt_for_Python/Considerations#Issues_using_shiboken2, and tried it out with using virtualenv==16.5.0 instead of python3.7's built-in venv module, to no avail.

Hence reporting this issue to please get it fixed ASAP. Here's the error message:

Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 22:22:05) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import shiboken2
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "C:\Users\John\Desktop\project\venv\lib\site-packages\shiboken2_init_.py", line 8, in <module>
   from .shiboken2 import *
ImportError: DLL load failed: The specified module could not be found.

Cheers,
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