FreeBSD/ports 47622c7 (r474723)devel/py-virtualenv Makefile distinfo

- Update to 16.0.0
- Add NO_ARCH
- Use options helpers

Changes:        https://virtualenv.pypa.io/en/stable/changes/
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+10-14devel/py-virtualenv/Makefile
+3-3devel/py-virtualenv/distinfo
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