[issue14470] Remove use of w9xopen in subporcess module

Changes by Andrew Svetlov : -- components: +Library (Lib), Windows priority: normal -> critical ___ Python tracker ___ ___ Python-bugs

[issue14470] Remove use of w9xopen in subporcess module

New submission from Andrew Svetlov : As Python 3.3 declare: Windows 2000 and Windows platforms which set COMSPEC to command.com are no longer supported due to maintenance burden. We need to drop corresponding code from subprocess. -- keywords: easy messages: 157321 nosy: asvetlov prior