[issue2405] Drop w9xpopen and all dependencies

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

Tim Peters once commented that w9xpopen cannot go away as long as people 
still use alternative shells (through COMSPEC) that still have the 
original issue that command.com had.

I don't know how relevant that still is, and whether perhaps breakage is 
acceptable if people install odd shells that are not fully compatible with 
cmd.exe.

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nosy: +loewis

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