Remove flex 3 compatibility mode from client build.

bigbluebutton-client/branding/default/build.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- BigBlueButton Branding build.xml for use by Hudson builds.   -->
-<project name="BigBlueButton Branding" basedir="../.." default="branding" >
+<project name="BigBlueButton Branding" basedir="../.." default="branding">
 	<property environment="env" />
 	<property name="DEBUG" value="true" />
 	<property name="BUILD_ENV" value="DEV" />
@@ -8,23 +8,18 @@
 	<property name="themeFile" value="BBBDefault.css" />
 	<property name="BASE_DIR" value="${basedir}" />
 	<property name="SRC_DIR" value="${BASE_DIR}/src" />
-		
+
 	<property name="OUTPUT_DIR" value="${BASE_DIR}/client" />
 	<taskdef resource="flexTasks.tasks" classpath="${FLEX_HOME}/ant/lib/flexTasks.jar" />
-	
+
 	<target name="init-ant-contrib">
-		<property name="ant-contrib.jar" location="${BASE_DIR}/build/lib/ant-contrib-0.6.jar"/>
-		<taskdef resource="net/sf/antcontrib/antcontrib.properties" classpath="${ant-contrib.jar}"/>
+		<property name="ant-contrib.jar" location="${BASE_DIR}/build/lib/ant-contrib-0.6.jar" />
+		<taskdef resource="net/sf/antcontrib/antcontrib.properties" classpath="${ant-contrib.jar}" />
 	</target>
-	  	
+
 	<target name="branding" depends="init-ant-contrib">
 		<sequential>
-			<mxmlc file="${BASE_DIR}/branding/default/style/css/${themeFile}" 
-				output="${OUTPUT_DIR}/branding/css/${themeFile}.swf" 
-				debug="${DEBUG}" 
-				mxml.compatibility-version="3.0.0" 
-				swf-version="13" 
-				optimize="true">
+			<mxmlc file="${BASE_DIR}/branding/default/style/css/${themeFile}" output="${OUTPUT_DIR}/branding/css/${themeFile}.swf" debug="${DEBUG}" incremental="true" swf-version="13" optimize="true">
 			</mxmlc>
 		</sequential>
 	</target>