Add hide_tool_bar config file setting

In preparation for toolbar implementation

src/unix/unix.c

@@ -40,6 +40,7 @@ int rctrl_is_lalt;
 int	update_icons;
 int	kbd_req_capture;
 int hide_status_bar;
+int hide_tool_bar;
 int fixed_size_x = 640;
 int fixed_size_y = 480;
 extern int title_set;