Toolset name change

[SVN r34155]

status/explicit-failures-markup.xml

@@ -2882,6 +2882,7 @@ for more information.
         <mark-expected-failures>
             <test name="complex_test"/>
             <toolset name="msvc"/>
+            <toolset name="vc-6*"/>
             <note author="John Maddock">
               Incomplete std::complex support make these tests pointless
               (the complex trig functions are absent).