added missing xtend compiler

DSL_SemanticAdaptation/be.uantwerpen.ansymo.semanticadaptation.cg.cpp/pom.xml

@@ -18,5 +18,16 @@
     <main.basedir>${project.parent.basedir}</main.basedir>
 	</properties>
 
+	<build>
+		<plugins>
+
+			<plugin>
+				<groupId>org.eclipse.xtend</groupId>
+				<artifactId>xtend-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+		
+		
+	</build>
 
 </project>