marked wide stream tests as expected failures on Cygwin (iostreams)

[SVN r29544]

status/explicit-failures-markup.xml

@@ -916,6 +916,7 @@
             <toolset name="gcc-2.95.3-linux"/>
             <toolset name="mingw"/>
             <toolset name="mingw-3_4_2"/>
+            <toolset name="gcc-3_3_3-cygwin"/>
             <note author="Jonathan Turkanis" refid="19"/>
         </mark-expected-failures>
         <mark-expected-failures>