Requirement tweaks

[MikeMcQuaid]

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More details in commit messages but: fix up tuntap and osxfuse requirements so Homebrew/homebrew-core#2075 and Homebrew/homebrew-core#2076 can be merged and tweak the requirements messaging based on the local testing of these.

CC @DomT4 @AnastasiaSulyagina

[UniqMartin]

It's probably a non-issue (or an irrelevant corner case), as most in-formula requirements tend to provide their own message method, but if that wasn't the case, this would result in pretty ugly output like:

$ brew install slimerjs
slimerjs: Formulary::FormulaNamespace4237eb49a894bb8c7e324716724ef7cb::FirefoxRequirement unsatisfied!

You can install with Homebrew Cask:
  brew cask install firefox
Error: An unsatisfied requirement failed this build.

[MikeMcQuaid]

👍 will strip everything up to and including the ::

[UniqMartin]

Two minor remarks, but otherwise 👍.

[DomT4]

Agree with @UniqMartin's points. I think it's safe to completely remove NonBinaryOsxfuseRequirement and presumably the related Dependency => Requirement logic from compat/requirements? Otherwise, 👍.

[MikeMcQuaid]

Agree with @UniqMartin's points. I think it's safe to completely remove NonBinaryOsxfuseRequirement and presumably the related Dependency => Requirement logic from compat/requirements? Otherwise, 👍.

Can't yet as the formula relies on it and we'll need to merge this before the formula change (and can remove afters)

[DomT4]

Can't yet as the formula relies on it and we'll need to merge this before the formula change (and can remove afters)

Bleh. Yeah, forgot this. 👍.