removed references to confirm.extension

Author: Alexandru Scvortov

build.xml

@@ -28,8 +28,6 @@
 
   <property name="AMQP_SPEC_JSON_PATH" value="${codegen.dir}/amqp-rabbitmq-${spec.version}.json"/>
 
-  <property name="RABBIT_SPEC_EXTENSIONS" value="${codegen.dir}/confirm-extension.json"/>
-
   <target name="amqp-generate-check" description="check if codegen needs to be run">
     <uptodate property="amqp.generate.notRequired">
       <srcfiles file="codegen.py"/>
@@ -52,7 +50,6 @@
       <arg line="codegen.py"/>
       <arg line="header"/>
       <arg line="${AMQP_SPEC_JSON_PATH}"/>
-      <arg line="${RABBIT_SPEC_EXTENSIONS}"/>
       <arg line="${src.generated}/com/rabbitmq/client/AMQP.java"/>
     </exec>
   	<fail message="Generation of AMQP.java failed with message:${line.separator}${amqp.generate.error1}">
@@ -69,7 +66,6 @@
       <arg line="codegen.py"/>
       <arg line="body"/>
       <arg line="${AMQP_SPEC_JSON_PATH}"/>
-      <arg line="${RABBIT_SPEC_EXTENSIONS}"/>
       <arg line="${src.generated}/com/rabbitmq/client/impl/AMQImpl.java"/>
     </exec>
   	<fail message="Generation of AMQPImpl.java failed with message:${line.separator}${amqp.generate.error2}">