WIN32_DEV CVS branch

We are no longer using the WIN32_DEV CVS branch.  We are doing all Win32
work in HEAD now.  I have already moved any WIN32_DEV changes up into
HEAD. I have updated the Win32 web page to indicate this:

    http://momjian.postgresql.org/main/writings/pgsql/win32.html

Marc, would you remove the nightly generation of the win32 tarballs?
Thanks.  I assume we can't remove the branch itself.

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