Fixed a misspelled platform name.

[SVN r33447]

status/explicit-failures-markup.xml

@@ -3999,7 +3999,7 @@ for more information.
 
         <mark-expected-failures>
             <test name="testwave"/>
-            <toolset name="qcc-3.3.5-gpp"/>
+            <toolset name="qcc-3.3.5_gpp"/>
             <note author="Hartmut Kaiser" refid="29"/>
         </mark-expected-failures>