[Python-Dev] Fixing buildbot/external(-amd64).bat files on Windows

[Christian Heimes]

Trent Nelson wrote:
> -   vcbuild db-4.4.20\build_win32\Berkeley_DB.sln /build Debug /project db_static
> +   devenv /upgrade db-4.4.20\build_win32\Berkeley_DB.sln
> +   devenv db-4.4.20\build_win32\Berkeley_DB.sln /build Debug /project db_static

The upgrade is requires only once. It probably belongs next to the
checkout or svn up and not in the build section.

Christian