ublas --> unusable for cw 8.3 again

[SVN r25536]

status/explicit-failures-markup.xml

@@ -1074,7 +1074,7 @@ for more information.
         <mark-unusable>
             <toolset name="borland"/>
             <toolset name="borland-5.6.4"/>
-            <!--toolset name="cw-8.3*"/ -->
+            <toolset name="cw-8.3*"/>
             <note author="M.Stevens" refid="2"/>
         </mark-unusable>
         <test name="test2">