[issue25154] Drop the pyvenv script

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

I have a patch which will at least improve the error message when `python3 -m venv` fails because python3-venv isn't installed on Debian/Ubuntu.  I will work with Doko on this.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25154>
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