Extract and explicitly pass install-scripts to setuptools #530
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When part of a virtual environment, this option is specifically ignored in configuration files by setuptools, but not on the command line.
This is an actual fix for #518, which wasn't actually fixed by #520 but rather made it far less common.
The test added here doesn't actually create a virtual environment to validate the conditions which motivated this fix, but the test will fail if run under a virtual environment without this fix.