Send some error output to gdb_stderr

This changes some code to send some error messages to gdb_stderr
rather than gdb_stdout.

gdb/breakpoint.c

@@ -13063,9 +13063,10 @@ update_breakpoint_locations (struct breakpoint *b,
       /* Ranged breakpoints have only one start location and one end
 	 location.  */
       b->enable_state = bp_disabled;
-      printf_unfiltered (_("Could not reset ranged breakpoint %d: "
-			   "multiple locations found\n"),
-			 b->number);
+      fprintf_unfiltered (gdb_stderr,
+			  _("Could not reset ranged breakpoint %d: "
+			    "multiple locations found\n"),
+			  b->number);
       return;
     }
 

gdb/event-top.c

@@ -494,7 +494,7 @@ stdin_event_handler (int error, gdb_client_data client_data)
       if (main_ui == ui)
 	{
 	  /* If stdin died, we may as well kill gdb.  */
-	  printf_unfiltered (_("error detected on stdin\n"));
+	  fprintf_unfiltered (gdb_stderr, _("error detected on stdin\n"));
 	  quit_command ((char *) 0, 0);
 	}
       else

gdb/inf-loop.c

@@ -85,7 +85,7 @@ inferior_event_handler (enum inferior_event_type event_type)
       break;
 
     default:
-      printf_unfiltered (_("Event type not recognized.\n"));
+      fprintf_unfiltered (gdb_stderr, _("Event type not recognized.\n"));
       break;
     }
 }