In order to make menu selections visible on older terminals without
highlighting or color capability, the menu library marks selected
items in a menu with a prefix string.
The function set_menu_mark sets the mark string for the given menu.
Calling set_menu_mark with a null menu item will abolish the mark
string. Note that changing the length of the mark string for a menu
while the menu is posted is likely to produce unhelpful behavior.
The default string is "-" (a dash). Calling set_menu_mark with a non-
NULL menu argument will change this default.
The function menu_mark returns the menu's mark string (or NULL if
there is none).
The function menu_mark returns a pointer (which may be NULL). It
does not set errno.
The function set_menu_mark may return the following error codes:
E_OK The routine succeeded.
Routine detected an incorrect or out-of-range argument.
System error occurred (see errno).
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