emergency fix: all compilers but MIPSpro 7.3 choke on mpl::protect instead of the original plain protect

[SVN r24963]

include/boost/mpl/protect.hpp

@@ -28,7 +28,11 @@ template<
     >
 struct protect : T
 {
+#if BOOST_WORKAROUND(__EDG_VERSION__, == 238)
     typedef mpl::protect type;
+#else
+    typedef protect type;
+#endif
 };
 
 #if defined(BOOST_MPL_CFG_BROKEN_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES)