Pull request from argrath: remove a bunch of '#ifdef LINT' code
snippets that no longer serve any useful purpose.
If a lint that handles C99 is ever produced, persumably it won't
need the fairly ridiculous hacks for 'static' and 'long'/'long *'.
Closes #928
replace some old 'time_t' hackery in system.h and hacklib.c with something
less obtrusive in unixconf.h
remove the per dungeon level door limit
+remove various '#if LINT' hacks used to suppress warnings from pre-ANSI 'lint'