[issue10089] Add support for arbitrary -X options

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Why wouldn't they? A standard way to extend the command line options seems useful in all environments.
Now the interpretation of these options are subject to variations of course...

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nosy: +amaury.forgeotdarc

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