refactor: remove javaversion check

- xmlbeans no longer supports the GENERATE_JAVA_VERSION attribute, i.e. the constant still exists but is not referenced and there is no way to set it with the new API

Author: cortlepp

modules/xmlbeans-codegen/src/main/java/org/apache/axis2/xmlbeans/CodeGenerationUtility.java

@@ -201,13 +201,8 @@ public static TypeMapper processSchemas(List schemas,
             BindingConfig bindConf = new Axis2BindingConfig(cgconfig.getUri2PackageNameMap(),
                     xsdConfigFile, javaFiles, classpath);
 
-            //-Ejavaversion switch to XmlOptions to generate 1.5 compliant code
             XmlOptions xmlOptions	=	new XmlOptions();
             xmlOptions.setEntityResolver(er);
-            //test if javaversion property in CodeGenConfig
-            if(null!=cgconfig.getProperty("javaversion")){
-            	xmlOptions.put(XmlOptions.GENERATE_JAVA_VERSION,cgconfig.getProperty("javaversion"));
-            }
 
             sts = XmlBeans.compileXmlBeans(
                     // set the STS name; defaults to null, which makes the generated class