Updated function key mapping because of possible changes to NOTIFY.

The TTY driver now only notifies the IS server about function key event,
but does not tell which keys are pressed. The IS servers queries the TTY
driver to find out about this.

kernel/system.h

@@ -54,11 +54,7 @@ _PROTOTYPE( int do_setalarm, (message *m_ptr) );
 #define         do_signalrm 	do_setalarm
 #define         do_syncalrm 	do_setalarm
 
-#if ENABLE_K_TRACING
 _PROTOTYPE( int do_trace, (message *m_ptr) );		/* process tracing */
-#else
-#define do_trace do_unused
-#endif
 
 
 #endif	/* SYSTEM_H */