Allow installing vyper when it does not validate

[antazoey]

Overview

I want a flag to skip validation for an installed vyper when you do vvm.install.install_vyper("0.3.7")

Otherwise I get:

VyperInstallationError: Downloaded binary would not execute, or returned unexpected output.

Specification

vvm.install.install_vyper("0.3.7", validate=False)

^ so even though it fails on the mac chip, I can still manage the binary.

[charles-cooper]

hm i think the solution might be ok, but why can't you just call install_vyper() in a try/except block? you need the binary around for some reason?