Use builtin cd for venv-activate.sh
Use builtin cd for venv-activate.sh

`builtin cd` is safer, as simple `cd` may fail when cd is aliased to something
that outputs to stdout in the local environment

Dark5ide/mycroft-core,Dark5ide/mycroft-core,MycroftAI/mycroft-core,forslund/mycroft-core,forslund/mycroft-core,MycroftAI/mycroft-core