RT signal may not be a good idea

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@975 c046a42c-6fe2-441c-8c8c-71466251a162

vl.c

@@ -921,8 +921,7 @@ static void init_timers(void)
             setitimer(ITIMER_REAL, &itv, NULL);
 
             /* use the RTC */
-            sigaction(SIGRTMIN, &act, NULL);
-            fcntl(rtc_fd, F_SETSIG, SIGRTMIN);
+            sigaction(SIGIO, &act, NULL);
             fcntl(rtc_fd, F_SETFL, O_ASYNC);
             fcntl(rtc_fd, F_SETOWN, getpid());
         } else {