Win32: detection of connect() errors in select(). On Windows, connect() errors are only reported via exceptfds descriptor set from select(). Previously exceptfds was set to NULL, and connect() errors were not detected at all, so connects to closed ports were waiting till a timeout occurred. Since ongoing connect() means that there will be a write event active, except descriptor set is copied from the write one. While it is possible to construct except descriptor set as a concatenation of both read and write descriptor sets, this looks unneeded. With this change, connect() errors are properly detected now when using select(). Note well that it is not possible to detect connect() errors with WSAPoll() (see https://daniel.haxx.se/blog/2012/10/10/wsapoll-is-broken/).

uwsgi_param  QUERY_STRING       $query_string;
uwsgi_param  REQUEST_METHOD     $request_method;
uwsgi_param  CONTENT_TYPE       $content_type;
uwsgi_param  CONTENT_LENGTH     $content_length;

uwsgi_param  REQUEST_URI        $request_uri;
uwsgi_param  PATH_INFO          $document_uri;
uwsgi_param  DOCUMENT_ROOT      $document_root;
uwsgi_param  SERVER_PROTOCOL    $server_protocol;
uwsgi_param  REQUEST_SCHEME     $scheme;
uwsgi_param  HTTPS              $https if_not_empty;

uwsgi_param  REMOTE_ADDR        $remote_addr;
uwsgi_param  REMOTE_PORT        $remote_port;
uwsgi_param  SERVER_PORT        $server_port;
uwsgi_param  SERVER_NAME        $server_name;