henplus: don't put /usr/local/lib in DYLD_LIBRARY_PATH

Fixes #34302.
Add `dev` package for docker-based dev environments

This is a Homebrew formula to use the latest binary build of my tool
[`dev`](http://github.com/Xe/dev) from the github release. This is a
single, static binary that should run on any AMD64 mac.
dev: add 0.3 bottle.