[Patch] Option parsing: allow option aliases in option groups

[Hans Wennborg]

Hi,

This patch makes the option parsing code allow for having option
aliases in option groups.

Aliases in groups were previously disallowed by an assert. As far as I
know, there is no technical reason for this, and I would like to allow
them, to be able to put cl.exe compatible options in their own group,
but have some of them (like "/c" for example) be aliases.

Please take a look.

Thanks,
Hans
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