This commit is to back port a fix in 0.3.3 dev branch to the current trunk. Adding boost_system as a required dependency as boost_filesystem is dependent on it. On linux distros with newer versions of gcc FIFE is failing to configure properly without boost_system in the lib list. [t:540]

<?fife type="object"?>
<object id="goldstack" namespace="http://www.fifengine.de/xml/rpg" blocking="0" static="1">
	<image source="000.png" direction="0" />
</object>