marked multi_index unusable on SunPro 5.3

[SVN r28408]

status/explicit-failures-markup.xml

@@ -800,6 +800,10 @@ for more information.
                 fine.
             </note>
         </mark-unusable>
+        <mark-unusable>
+            <toolset name="sunpro-5_3"/>
+            <note author="J. L&#243;pez" date="22 Apr 2005" refid="17"/>
+        </mark-unusable>
         <mark-expected-failures>
             <test name="test_serialization"/>
             <toolset name="msvc-stlport"/>