Update maven to call the plugin to generate javalite code.

java/lite/generate-sources-build.xml

@@ -2,8 +2,9 @@
     <echo message="Running protoc ..."/>
     <mkdir dir="${generated.sources.lite.dir}"/>
     <exec executable="${protoc}">
-        <arg value="--java_out=lite:${generated.sources.lite.dir}"/>
+        <arg value="--javalite_out=${generated.sources.lite.dir}"/>
         <arg value="--proto_path=${protobuf.source.dir}"/>
+        <arg value="--plugin=protoc-gen-javalite=${protoc-gen-javalite}"/>
         <arg value="${protobuf.source.dir}/google/protobuf/any.proto"/>
         <arg value="${protobuf.source.dir}/google/protobuf/api.proto"/>
         <arg value="${protobuf.source.dir}/google/protobuf/descriptor.proto"/>

java/lite/pom.xml

@@ -33,6 +33,7 @@
   <properties>
     <core.root>../core</core.root>
     <test.proto.dir>${core.root}/src/test/proto</test.proto.dir>
+    <protoc-gen-javalite>${protobuf.source.dir}/protoc-gen-javalite</protoc-gen-javalite>
   </properties>
 
   <build>