Changed toolset name.

[SVN r34138]

status/explicit-failures-markup.xml

@@ -4032,6 +4032,7 @@ for more information.
         <mark-unusable>
             <toolset name="msvc"/>
             <toolset name="VC6*"/>
+            <toolset name="vc-6*"/>
             <note author="John Maddock">
                 VC6 has a buggy using declaration syntax which
                 basically makes it impossible to implement the 
@@ -4825,3 +4826,4 @@ for more information.
 </explicit-failures-markup>
 
 
+