couple minor adjustments to date-time results markup

[SVN r29372]

status/explicit-failures-markup.xml

@@ -386,9 +386,9 @@
             </mark-failure>
         </test>
 
-        <test name="testtime_serialize_xml">
+        <test name="testtime_serialize_xml*">
             <mark-failure>
-            <toolset name="msvc*"/>
+            <toolset name="vc7"/>
             <note author="J. Garland">XML serialization is not supported on this compiler.
             </note>
             </mark-failure>