Use public property instead of setter method to improve compatibility

program/lib/Roundcube/rcube_session.php

@@ -44,10 +44,16 @@ class rcube_session
     private $secret = '';
     private $ip_check = false;
     private $logging = false;
-    private $nowrite = false;
     private $storage;
     private $memcache;
 
+    /**
+     * Blocks session data from being written to database.
+     * Can be used if write-race conditions are to be expected
+     * @var boolean
+     */
+    public $nowrite = false;
+
 
     /**
      * Default constructor
@@ -729,16 +735,6 @@ class rcube_session
     }
 
 
-    /**
-     * Blocks session data from being written to database.
-     * Can be used if write-race conditions are to be expected
-     */
-    function nowrite($block = true)
-    {
-        $this->nowrite = $block;
-    }
-
-
     /**
      * Check session authentication cookie
      *