Categorise typeof tests

[SVN r37565]

status/explicit-failures-markup.xml

@@ -2528,8 +2528,8 @@ for more information.
                 This compiler is not supported.
             </note>
         </mark-unusable>
-        <mark-expected-failures>
-            <test name="*_native"/>
+		<mark-expected-failures>
+            <test name="*_native" category="Native compiler support"/>
             <toolset name="acc"/>
             <toolset name="vc-8_0*"/>
             <toolset name="msvc-8.0*"/>