update date-time failures for stlport4 msvc 7.1

[SVN r36995]

status/explicit-failures-markup.xml

@@ -960,6 +960,7 @@
             <test name="testdate_facet_new"/>
             <test name="testdate_facet_new_dll"/>
             <test name="testtime_facet"/>
+            <toolset name="msvc-7.1_stlport4"/>
             <toolset name="msvc-8.0_stlport5"/>
             <note author="J. Garland">
                The STLPort standard library has issues with the handling