removed XFAIL mark; it will be back in a few weeks if the failure remains

From-SVN: r22480

gcc/testsuite/g++.old-deja/g++.other/nested2.C

@@ -8,5 +8,5 @@ struct M1 {
 struct M2 {
     struct I                            {};
     struct J : virtual public M2::I,
-               virtual public M1::I     {}; // XFAIL *-*-*
+               virtual public M1::I     {};
 };