The function new_menu creates a new menu connected to a specified
item pointer array (which must be NULL-terminated).
The function free_menu disconnects menu from its item array and
frees the storage allocated for the menu.
The function new_menu returns NULL on error. It sets errno
according to the function's failure:
No items are connected to the menu.
System error occurred, e.g., malloc failure.
The function free_menu returns one of the following:
E_OK The routine succeeded.
System error occurred (see errno(3)).
Routine detected an incorrect or out-of-range argument.
The menu has already been posted.
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