fixed OGRE_AUTO_MUTEX compilation issue in OFS plugin, as proposed by 'dermont' here: http://forum.ogitor.org/viewtopic.php?p=7499#p7499
fixed OGRE_AUTO_MUTEX compilation issue in OFS plugin, as proposed by 'dermont' here: http://forum.ogitor.org/viewtopic.php?p=7499#p7499

jacmoe/ogitor,jacmoe/ogitor,jacmoe/ogitor,jacmoe/ogitor