updates for WTP 101 update site - yet another fix for "raw" PDE install

org.eclipse.wtp.releng.webupdatesite/WebContent/site.xml

@@ -1300,7 +1300,12 @@
                  url="../../eclipse/updates/3.1/plugins/org.eclipse.jdt.launching.macosx_3.1.0.jar"/>
         <archive path="plugins/org.eclipse.jdt.junit.runtime_3.1.0.jar"
                  url="../../eclipse/updates/3.1/plugins/org.eclipse.jdt.junit.runtime_3.1.0.jar"/>
+
        <archive path="plugins/org.eclipse.pde_3.1.0.jar"
                  url="../../eclipse/updates/3.1/plugins/org.eclipse.pde_3.1.0.jar"/>
+        <archive path="plugins/org.eclipse.pde.build_3.1.0.jar"
+                 url="../../eclipse/updates/3.1/plugins/org.eclipse.pde.build_3.1.0.jar"/>
+        <archive path="plugins/org.eclipse.pde.junit.runtime_3.1.0.jar"
+                 url="../../eclipse/updates/3.1/plugins/org.eclipse.pde.junit.runtime_3.1.0.jar"/>
 
 </site>