Mark up some unusable platforms of PTree.

[SVN r56272]

status/explicit-failures-markup.xml

@@ -3940,6 +3940,26 @@ for more information.
 
     </library>
 
+    <library name="property_tree">
+        <mark-unusable>
+            <toolset name="borland-*"/>
+            <note author="Sebastian Redl">Inherited from MultiIndex</note>
+        </mark-unusable>
+        <mark-unusable>
+            <toolset name="sun-5.*"/>
+            <note author="Sebastian Redl">
+                Lots of test failures complaining about the ambiguity of a
+                const and a non-const overload of the same function.
+            </note>
+        </mark-unusable>
+        <mark-unusable>
+            <toolset name="vacpp"/>
+            <note author="Sebastian Redl">
+                This compiler seems to have very broken name lookup.
+            </note>
+        </mark-unusable>
+    </library>
+
      <!-- pointer container -->
     <library name="ptr_container">
         <mark-unusable>