[merge] Allow '-' as an argument

[John Arbash Meinel]

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Martin Pool wrote:
> On 11 Jul 2006, John Arbash Meinel <john at arbash-meinel.com> wrote:

...

>> The attached patch just adds a test that '-' is valid as a command line
>> argument, and gets parsed as an argument rather than an option.
> 
> +1, though I thought we already fixed this.
> 

Someone proposed a fix, but nobody ever wrote a test and actually got it
submitted.

John
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