[issue10089] Add support for arbitrary -X options

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> (It also makes it clear that other implementations aren't obliged to
> implement *any* particular interface to the -X options. Requiring that 
> would go against the whole spirit of -X)

Agreed. I'll update the patch to use sys._xoptions.

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