pos_menu_cursor moves the cursor in the window of menu to
the correct position to resume menu processing.
This is needed after the application calls a curses library I/O routine.
<Return> value
This routine returns one of the following:
E_OK
-
The routine returned successfully.
E_SYSTEM_ERROR
-
System error.
E_BAD_ARGUMENT
-
An incorrect argument was passed to the routine.
E_NOT_POSTED
-
The menu has not been posted.
Notices
The header file menu.h automatically includes the header files
eti.h and ocurses.h.