Re-enable rtti again.
Re-enable rtti again.

It causes problems with tr1/shared_ptr.h implementation on several platforms.

apitrace/apitrace,EoD/apitrace,tuanthng/apitrace,apitrace/apitrace,surround-io/apitrace,surround-io/apitrace,surround-io/apitrace,swq0553/apitrace,EoD/apitrace,surround-io/apitrace,joshua5201/apitrace,joshua5201/apitrace,EoD/apitrace,swq0553/apitrace,apitrace/apitrace,trtt/apitrace,joshua5201/apitrace,joshua5201/apitrace,tuanthng/apitrace,trtt/apitrace,swq0553/apitrace,schulmar/apitrace,apitrace/apitrace,schulmar/apitrace,swq0553/apitrace,swq0553/apitrace,schulmar/apitrace,trtt/apitrace,joshua5201/apitrace,tuanthng/apitrace,schulmar/apitrace,schulmar/apitrace,surround-io/apitrace,EoD/apitrace,trtt/apitrace,tuanthng/apitrace,tuanthng/apitrace,EoD/apitrace,trtt/apitrace