Bring required compilers list closer into sync with actual testers and list discussion

[SVN r41328]

status/explicit-failures-markup.xml

@@ -36,10 +36,10 @@
     <mark-toolset name="gcc-mingw-3.4.5" status="required"/>
     <mark-toolset name="hp_cxx-71_006_tru64" status="required"/>
     <mark-toolset name="intel-linux-9.0" status="required"/>
-    <mark-toolset name="intel-vc71-win-9.1" status="required"/>
+    <mark-toolset name="intel-vc8-win-10.0" status="required"/>
     <mark-toolset name="msvc-7.1" status="required"/>
     <mark-toolset name="msvc-8.0" status="required"/>
-    <mark-toolset name="sun-5.9" status="required"/>
+    <mark-toolset name="msvc-8.0_64" status="required"/>
 
     <!-- /////////////// Libraries /////////////// -->