[bugfix: don't ingore the return value from rts_evalIO()
Simon Marlow <marlowsd@gmail.com>**20081104142147] hunk ./rts/posix/Signals.c 151
-	rts_evalIO(cap,&base_GHCziConc_ensureIOManagerIsRunning_closure,NULL);
+	cap = rts_evalIO(cap,&base_GHCziConc_ensureIOManagerIsRunning_closure,NULL);