Ensure we have MS global tables defined during network install. See #11644

git-svn-id: http://svn.automattic.com/wordpress/trunk@13337 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/network.php

@@ -16,6 +16,10 @@ require_once( './admin.php' );
 if ( ! is_super_admin() )
 	wp_die( __( 'You do not have sufficient permissions to manage options for this blog.' ) );
 
+// We need to create references to ms global tables to enable Network.
+foreach ( $wpdb->tables( 'ms_global' ) as $table => $prefixed_table )
+	$wpdb->$table = $prefixed_table;
+
 $title = __( 'Network Settings' );
 $parent_file = 'tools.php';