Cleaned up `include/grub/normal.h'. Grouped prototypes by
definition file, and functions defined in `normal/menu.c' have had
their prototypes moved to `include/grub/menu.h' for consistency.
* include/grub/menu.h (grub_menu_execute_callback): Added; moved
from normal.h.
(grub_menu_get_entry): Likewise.
(grub_menu_get_timeout): Likewise.
(grub_menu_set_timeout): Likewise.
(grub_menu_execute_entry): Likewise.
(grub_menu_execute_with_fallback): Likewise.
(grub_menu_entry_run): Likewise.
* include/grub/normal.h: Re-ordered and grouped function
prototypes by file that the function is defined in.
(grub_menu_execute_callback): Removed; moved to menu.h.
(grub_menu_get_entry): Likewise.
(grub_menu_get_timeout): Likewise.
(grub_menu_set_timeout): Likewise.
(grub_menu_execute_entry): Likewise.
(grub_menu_execute_with_fallback): Likewise.
(grub_menu_entry_run): Likewise.
(grub_menu_addentry): Renamed from this ...
(grub_normal_add_menu_entry): ... to this.
* normal/main.c (grub_menu_addentry): Renamed from this ...
(grub_normal_add_menu_entry): ... to this.
* script/sh/execute.c (grub_script_execute_menuentry): Update
reference to renamed grub_menu_addentry function.