minor: build generic installer on CI

SVN: 23008

installation/build/build.xml

@@ -167,7 +167,12 @@
 	<!--
         // Task for continuous integration server.
   -->
-	<target name="ci" depends="dist-screening" />
+  <target name="clean" description="Cleans distribution directory.">
+    <delete dir="${dist}" failonerror="true" />
+    <mkdir dir="${dist}" />
+  </target>
+
+	<target name="ci" depends="clean, dist" />
 
 
 </project>