Mark unused parameters

sys/unix/hints/linux

@@ -34,6 +34,8 @@ CFLAGS+=-DCURSES_GRAPHICS
 #CFLAGS+=-DSCORE_ON_BOTL
 #CFLAGS+=-DMSGHANDLER
 #CFLAGS+=-DTTY_TILES_ESCCODES
+CFLAGS+=-Wunused
+CFLAGS+=-Wunused-parameter
 
 # when building liblua.a, avoid warning that use of tmpnam() should be
 # replaced by mkstemp(); the lua code doesn't use nethack's config.h so