BETA/STABLE: Fix for JDK7 Requirement in builders (now using "java.lang.AutoCloseable" which is introduced in JDK7), thanks FBIagent.

L2J_Server_BETA/build.xml

@@ -55,7 +55,7 @@
 	</pathconvert>
 
 	<target name="verifyRequirements" description="Checks if the necessary requirements for building L2J are fulfilled">
-		<available classname="javax.script.ScriptContext" property="JDK7.present" />
+		<available classname="java.lang.AutoCloseable" property="JDK7.present" />
 		<fail unless="JDK7.present" message="JDK 7 or greater is required." />
 	</target>