[Toybox] Allow --help after other arguments?

[Ryan Prichard]

$ ls -l --help
ls: Unknown option 'help' (see "ls --help")

I tend to add `--help` to the end of a command line that I'm constructing,
so I was surprised by toybox's requirement that `--help` be first. Maybe
toybox should be more accommodating?

Maybe it'd matter more with an alias, e.g.:

$ alias ls='ls --color=auto'

$ ls --help
ls: Unknown option 'help' (see "ls --help")
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