for users who have compiled isapi_wsgi on x64 

Fix for users who have compiled isapi_wsgi on x64 Python. It would be nice to clarify if indeed  OMERO.web is a "32-bit application" - not sure who wrote that, as we can pull it out if the only thing that makes OMERO.web a 32-bit app is the use of x32 ISAPI_WSGI