Added expected failure markup for the test weighted_tail_variate_means on Tru64/CXX.

[SVN r43438]

status/explicit-failures-markup.xml

@@ -56,6 +56,14 @@
           <toolset name="acc"/>
           <note author="Boris Gubenko" refid="38"/>
       </mark-expected-failures>
+      <mark-expected-failures>
+        <test name="weighted_tail_variate_means"/>
+        <toolset name="hp_cxx-71*"/>
+        <note author="Markus Schoepflin">
+          This failure is caused by a timeout when compiling the test. It
+          passes when the timeout value is increased.
+        </note>
+      </mark-expected-failures>
     </library>
 
     <!-- minmax -->