Remove unused parameter to process_signals.

Need to find a better way of handling warning/error/fatal messages,
in general.  Thinking of creating another, small API for it.

vitunes.c

@@ -188,7 +188,7 @@ main(int argc, char *argv[])
       struct timeval  tv;
 
       /* handle any signal flags */
-      process_signals(true);
+      process_signals();
 
       tv.tv_sec = 1;
       tv.tv_usec = 0;