Mark up some Intel test failures of PTree (that compiler is simply too slow).

[SVN r56307]

status/explicit-failures-markup.xml

@@ -3958,6 +3958,16 @@ for more information.
                 This compiler seems to have very broken name lookup.
             </note>
         </mark-unusable>
+        <mark-expected-failures>
+            <test name="test_property_tree"/>
+            <test name="test_json_parser"/>
+            <toolset name="intel-darwin-*"/>
+            <toolset name="intel-linux-*"/>
+            <note author="Sebastian Redl">
+                Tend to crash the compiler (Intel 10) or simply take too long
+                (Intel 11).
+            </note>
+        </mark-expected-failures>
     </library>
 
      <!-- pointer container -->