tweak build for freebsd 'sed' and wheel version check

[mattip]

A few problems appeared in the builds:

• macos sed does not have a \0 output group for the whole match, use a capture group and \1 instead
• tweak the wheel build version comparison, it choked on a .dev suffix`
• no need for a sub-sub version specifier, I did not upload the wheels. Before the upload, both NumPy and SciPy should have a pin so the wheel version update can be done in a controlled fashion.