add helpers for formula tests
show cmd being executed
use test helpers
GCC: Tiger-specific patch was fixed upstream

Closes #31089.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>
outdated: allow passing formulae as arguments.

If formulae names are passed as arguments check if just they are outdated. Additionally, return a failed code if they are outdated.

This will hopefully be able to stop people complaining about the outdated error code as they can now just run e.g.:
`brew outdated git && brew upgrade git`

Closes #31242.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
aterm: add 2.8 bottle.