Ignore all relative paths in `secure_path`

[squell]

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Describe the feature you'd like see implemented in sudo-rs Right now sudo-rs treats . in secure_path/PATH by moving it "to the rear", like ogsudo does on Linux. But on FreeBSD, ogsudo is compiled with an option which makes it ignore . completely.

In fact, we should just ignore all relative paths (not that anybody ever puts these in a PATH).

What problem can be solved with this feature? This isn't a security feature, but it will make sudo-rs misconfiguration slightly harder.

Describe alternatives you've considered Simply ignore the issue, since secure_path should always be set anyway.

Additional context There used to be a time where people had . in their paths.

ogsudo cannot really change the default to "ignore ." since somewhere someone will complain about it; since we don't have that large a userbase yet that's not a problem for us.