drop `uptodate()' check from hack(6)

drop `uptodate()' check from hack(6)

hack(6) scrapes $PATH to find its executable and compare the mtime to
the save file and bone file.  If the game is newer than those, they're
not loaded.

Drop this feature.  /usr/games is not in the default $PATH anymore, and
the format for those file didn't change since the import.

Diff from Anton Konyahin (me [at] konyahin [dot] xyz)