Marked MSVC 7.1 optional_test failure as "expected", because of an ADL-related compiler issue.

[SVN r44862]

status/explicit-failures-markup.xml

@@ -2516,6 +2516,15 @@ for more information.
             <toolset name="gcc-3_3-darwin"/>
             <note author="Fernando Cacciola" refid="2"/>
         </mark-expected-failures>
+        <mark-expected-failures>
+            <test name="optional_test"/>
+            <toolset name="msvc-7.1"/>
+            <note author="Niels Dekker" date="2008-04-28">
+            MSVC 2003 (7.1) does not always do argument-dependent lookup (ADL), when it should.
+            This causes test failures when swapping boost::optional&lt;T&gt;, for
+            T = optional_swap_test::class_whose_default_ctor_should_be_used.
+            </note>
+        </mark-expected-failures>
     </library>
 
     <library name="pool">