removing npx man page

I've been told to post it here. please cc me for replies. thanks.

npx(4) referred to 387 support for x86 at some point.

it's not really a driver any more. we don't attach npx at acpi, etc.
moreover, all of the code related to it was renamed, so you will be
hard-pressed to find any references to 'npx' anywhere.

This patch removes it and all references to it:
http://coypu.sdf.org/npx4-remove

I intend to commit it in a few days, unless anyone objects.