mark up some proto failures

[SVN r48666]

status/explicit-failures-markup.xml

@@ -2567,6 +2567,16 @@ for more information.
         </mark-expected-failures>
     </library>
 
+    <!-- proto -->
+    <library name="proto">
+      <mark-unusable>
+        <toolset name="sun-5.7"/>
+        <toolset name="sun-5.8"/>
+        <toolset name="sun-5.9"/>
+        <toolset name="borland-*"/>
+      </mark-unusable>
+    </library>
+
     <!-- rational -->
     <library name="rational">
         <mark-expected-failures>