[issue36500] Add "regen-*" equivalent projects for Windows builds

[anthony shaw]

anthony shaw <anthony.p.shaw at gmail.com> added the comment:

Project now also does:
regen-symbol (regenerate Lib/symbol.py)
and regen-keyword (regenerate Lib/keyword.py)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36500>
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