Install fails on Windows 10 with PyPy 2.7 and ViperMonkey Feb 2021 about vipermonkey HOT 2 CLOSED

Workaround: I managed to install oletools 0.54.1 (last version without msoffcrypto-tool) by running pypy -m pip install oletools==0.54.1.
But then the install fails again on regex, which also requires the Visual C++ compiler. Need to check if regex can be made optional for ViperMonkey.

from vipermonkey.

I found a way to fix this with a conditional dependency in setup.py and requirements.txt: regex will only be installed if the platform is not PyPy or not Windows (which is the same as not(PyPy and Windows)):

regex; platform_python_implementation!="PyPy" or platform_system!="Windows"

Also oletools has been fixed the same way to avoid installing msoffcrypto-tool (see decalage2/oletools#473). So once oletools 0.56.1 is on PyPI, we can change ViperMonkey to require oletools>=0.56.1 instead of ==0.54.1.

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