This method is only used internally and we always pass strings.

This method is called in two places, always with two arguments.

Fixes Homebrew/homebrew#31360.

Closes Homebrew/homebrew#31384.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

This matches the new markdown styling a bit better.

For easier capturing.

Closes Homebrew/homebrew#31303.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#30540.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

The major version is implicit in the compiler name. Since the name is
used when matching failures to compilers, we don't need to consider the
major version separately.

major_version is now only used internally by the failure object

If formulae names are passed as arguments check if just they are outdated. Additionally, return a failed code if they are outdated.

This will hopefully be able to stop people complaining about the outdated error code as they can now just run e.g.:
`brew outdated git && brew upgrade git`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 Homebrew/homebrew#31242.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>