Added missing -DHAVE_CONFIG_H to CFLAGS. It happens to be a no-op here

only because dc doesn't use anything in the gnu library that has a
significant dependency on config.h.

Simplified paths.

gnu/usr.bin/dc/Makefile

@@ -1,13 +1,13 @@
-#	$Id$
+#	$Id: Makefile,v 1.8 1998/05/01 09:51:31 andreas Exp $
 
-.PATH:	${.CURDIR}/../../../contrib/bc/dc \
-	${.CURDIR}/../../../contrib/bc/lib \
-	${.CURDIR}/../../../contrib/bc/doc
+BCDIR=	${.CURDIR}/../../../contrib/bc
+
+.PATH:	${BCDIR}/dc ${BCDIR}/lib ${BCDIR}/doc
 
 PROG=	dc
 SRCS=	array.c dc.c eval.c misc.c numeric.c stack.c string.c \
 	getopt.c getopt1.c number.c
-CFLAGS+=-I${.CURDIR} -I${.CURDIR}/../../../contrib/bc/h
+CFLAGS+=-I${.CURDIR} -I${BCDIR}/h -DHAVE_CONFIG_H
 DPADD=	${LIBM}
 LDADD=	-lm
 SUBDIR=	doc