sim: erc32/h8300/m68hc11: trim unused functions

These funcs are only used with the old run.o, and these sims use nrun.o,
so drop these stub funcs.

sim/h8300/compile.c

@@ -4594,15 +4594,6 @@ sim_resume (SIM_DESC sd, int step, int siggnal)
   h8_set_mask (sd, oldmask);
 }
 
-int
-sim_trace (SIM_DESC sd)
-{
-  /* FIXME: Unfinished.  */
-  (*sim_callback->printf_filtered) (sim_callback,
-				    "sim_trace: trace not supported.\n");
-  return 1;	/* Done.  */
-}
-
 int
 sim_write (SIM_DESC sd, SIM_ADDR addr, const unsigned char *buffer, int size)
 {
@@ -4790,14 +4781,6 @@ sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc)
   sim_engine_get_run_state (sd, reason, sigrc);
 }
 
-/* FIXME: Rename to sim_set_mem_size.  */
-
-void
-sim_size (int n)
-{
-  /* Memory size is fixed.  */
-}
-
 static void
 set_simcache_size (SIM_DESC sd, int n)
 {
@@ -5094,9 +5077,3 @@ sim_create_inferior (SIM_DESC sd, struct bfd *abfd, char **argv, char **env)
   
   return SIM_RC_OK;
 }
-
-void
-sim_set_callbacks (struct host_callback_struct *ptr)
-{
-  sim_callback = ptr;
-}