dat/Makefile spotless

Testing some hints revisions resulted in some bafflement which
turned out to be caused by 'make spotless' in the dat subdirectory
not removing 'options'.  It wasn't removing several other generated
files either.  That used to work but got clobbered when the lua
special levels replaced levcomp and dgncomp.

sys/unix/Makefile.dat

@@ -1,4 +1,4 @@
-#      NetHack Datafiles Makefile.dat $NHDT-Date: 1447844574 2018/04/25 19:25:54 $ $NHDT-Branch: NetHack-3.6.0 $:$NHDT-Revision: 1.22 $
+#      NetHack Datafiles Makefile.dat $NHDT-Date: 1596486993 2020/08/03 20:36:33 $ $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.32 $
 # Copyright (c) 2018 by Pasi Kallinen
 # NetHack may be freely redistributed.  See license for details.
 
@@ -116,18 +116,21 @@ bogusmon:	bogusmon.txt ../util/makedefs
 options:	../util/makedefs
 	../util/makedefs -v
 
-
+# these don't actually do anything useful now that levcomp and dngcomp are gone
 spec_levs:
 	touch spec_levs
-
 quest_levs:
 	touch quest_levs
 
 # gitinfo.txt is optionally made by src/Makefile when creating date.h
+# spec_levs and quest_levs are empty marker files to control 'make' actions
 clean:
-	-rm -f gitinfo.txt
+	-rm -f spec_levs quest_levs gitinfo.txt
 
 spotless: clean
-	-rm -f nhdat x11tiles beostiles pet_mark.xbm pilemark.xbm rip.xpm mapbg.xpm
-	-rm -f rip.img GEM_RSC.RSC title.img nh16.img NetHack.ad
-	-rm -f nhsplash.xpm nhtiles.bmp
+	-rm -f nhdat $(VARDAT) \
+		x11tiles pet_mark.xbm pilemark.xbm rip.xpm mapbg.xpm \
+		rip.img GEM_RSC.RSC title.img nh16.img NetHack.ad \
+		nhsplash.xpm nhtiles.bmp beostiles
+
+#eof#