Bug 535509 - Conflicting non-Eclipse org.eclipse.jdt.core in Photon
release repo

- try to workaround error of selecting the wrong version of jdt.core
diff --git a/releng/build-scripts/build/run.xml b/releng/build-scripts/build/run.xml
index 9c7570d..d86e505 100644
--- a/releng/build-scripts/build/run.xml
+++ b/releng/build-scripts/build/run.xml
@@ -65,7 +65,7 @@
 
 		<!--	directories for update sites: -->
 		<property name="compilerUpdatesDir"		value="${user.dir}/updateSiteCompiler"/>
-		<property name="previousPublishedUpdatesDir"		value="http://download.eclipse.org/objectteams/updates/ot2.7/201806051508"/>
+		<property name="previousPublishedUpdatesDir"		value="http://download.eclipse.org/objectteams/updates/ot2.7/previous"/>
 		<property name="otdtUpdatesDir" 		value="${user.dir}/updateSite"/>
 		<property name="testsUpdatesDirBase" 	value="${user.dir}/updateSiteTests"/>
 			<!-- will have sub directories "eclipse" and "otdt" -->