Mark variables_map_test_dll failing on vc6, just like non-dll version.

[SVN r23876]

status/explicit-failures-markup.xml

@@ -626,6 +626,18 @@ for more information.
                 </note>
             </mark-failure>
         </test>
+        <test name="variable_map_test_dll">
+            <mark-failure>
+                <toolset name="msvc"/>
+                <note>
+                    The failures are caused by compiler bug: it's not possible to
+                    explicitly pass template arguments to member template function. The
+                    failure is serious and makes one of the primary interfaces
+                    unusable.
+                </note>
+            </mark-failure>
+        </test>
+
 
         <test name="cmdline_test_dll">
             <mark-failure>