prep for 1.5.5 patches

releng.wtpbuilder/scripts/build/label.xml

@@ -98,7 +98,11 @@
             append="true">
             buildLabel=${buildLabel}
         </echo>
-
+        <echo
+            file="${buildDirectory}/label.properties"
+            append="true">
+            buildBranch=${buildBranch}
+        </echo>
         <echo
             file="${buildDirectory}/buildmachineinfo.properties"
             append="true">