Three or four instances of one simple memory leak. Allocating a union
'anything' to pass to add_menu(), then not doing anything with it. The
value gets copied so there's no reason for the original to stick around.
[There are still lots of other memory leaks.]
There was no provision for malloc() potentially returning Null and it
wasn't integrated with nethack's MONITOR_HEAP. 'heaputil' shows that
the curses interface is leaking like a sieve. If some things are
actually being allocated separately and then freed from within curses,
those need to be thoroughly documented and maybe switched back to
malloc().
