Revert "TMP: disable deleting updateSite after phase 1"

This reverts commit d3035faa33af8ce7f594930d151c0d66250441a9.
diff --git a/releng/build-scripts/build/run.xml b/releng/build-scripts/build/run.xml
index ec9bf0b..739614b 100644
--- a/releng/build-scripts/build/run.xml
+++ b/releng/build-scripts/build/run.xml
@@ -274,11 +274,9 @@
             <property name="targetEclipseDir" value="${bootLocation}"/>
         </ant>
 		<!-- make space for next stage of building, avoid duplicate jdt.core plugins from stages 1 & 2 -->
-<!--
 		<delete includeemptydirs="true">
 		    <fileset dir="${otdtUpdatesDir}" includes="**"/>
 		</delete>
--->
     </target>
 
 	<!-- ==== BUILD STAGE 2: ==== -->