Fix toolset name.

[SVN r47964]

status/explicit-failures-markup.xml

@@ -3181,7 +3181,7 @@ for more information.
        </mark-expected-failures>
        <mark-expected-failures>
           <test name="test_tr1_long_double"/>
-          <toolset name="darwin"/>
+          <toolset name="darwin*"/>
           <note author="John Maddock">
              Some versions of the Darwin platform have insufficient long double support
              for us to be able to run this test.