Mike McQuaid 5ec5063dc7
Add brew update-if-needed
This uses the logic in `brew.sh` for deciding whether or not to run
`brew update --auto-update` and makes it a dedicated command that can
be used instead of `brew update` in scripts to be really fast in the
no-op case.

`brew update` will always do at least some updating which is a nicer
default but is much slower.
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