Add explicit failure on acc as requested by Boris Gubenko.

[SVN r37015]

status/explicit-failures-markup.xml

@@ -2641,6 +2641,16 @@ for more information.
             <note author="Aleksey Gurtovoy" date="19 Sep 2004" refid="26"/>
         </mark-expected-failures>
 
+       <mark-expected-failures>
+            <test name="is_lvalue_iterator"/>
+            <toolset name="acc"/>
+            <note author="Boris Gubenko">
+                For some currently unknown reason, with aCC6, this test can be compiled
+                only in strict ansi mode. Since on HP-UX/aCC6 boost testing is done in the
+                default compilation mode, this test fails to compile on this platform.
+            </note>
+       </mark-expected-failures>
+
     </library>