Further BUILDENV refinement, further fool-proofing of Makefiles and

[most importantly] put back dependencies accidentaly eliminated in
check-in #13342.

test/Makefile

@@ -7,8 +7,6 @@ TOP=		..
 CC=		cc
 INCLUDES=	-I$(TOP) -I../include $(KRB5_INCLUDES)
 CFLAG=		-g
-MAKEFILE=	Makefile
-MAKEDEPPROG=	makedepend
 MAKEDEPEND=	$(TOP)/util/domd $(TOP) -MD $(MAKEDEPPROG)
 PERL=		perl
 # KRB5 stuff
@@ -287,7 +285,11 @@ lint:
 	lint -DLINT $(INCLUDES) $(SRC)>fluff
 
 depend:
-	$(MAKEDEPEND) -- $(CFLAG) $(INCLUDES) $(DEPFLAG) -- $(PROGS) $(SRC)
+	@if [ -z "$(THIS)" ]; then \
+	    $(MAKE) -f $(TOP)/Makefile reflect THIS=$@; \
+	else \
+	    $(MAKEDEPEND) -- $(CFLAG) $(INCLUDES) $(DEPFLAG) -- $(PROGS) $(SRC); \
+	fi
 
 dclean:
 	$(PERL) -pe 'if (/^# DO NOT DELETE THIS LINE/) {print; exit(0);}' $(MAKEFILE) >Makefile.new