usr.bin/fortune: convert to OBJTOP/SRCTOP idioms

- Use OBJTOP/SRCTOP-relative paths when looking for include files and
  strfile.
- Add FORTUNES_OBJ and FORTUNES_SRC to abbreviate usr.bin/fortune
  pathing.

This is being done to simplify make output/idioms.

MFC after:	1 week
Reviewed by:	bdrewery
Sponsored by:	Dell EMC Isilon
Differential Revision:	D9916

usr.bin/fortune/Makefile.inc

@@ -1,3 +1,6 @@
-.if exists(${.CURDIR}/../../Makefile.inc)
-.include "${.CURDIR}/../../Makefile.inc"  
-.endif
+# $FreeBSD$
+
+FORTUNE_SRC=	${SRCTOP}/usr.bin/fortune
+FORTUNE_OBJ=	${OBJTOP}/usr.bin/fortune
+
+.include "${SRCTOP}/usr.bin/Makefile.inc"

usr.bin/fortune/datfiles/Makefile

@@ -15,7 +15,7 @@ FILESDIR=	${SHAREDIR}/games/fortune
 
 .for f in ${DB}
 $f.dat: $f
-	PATH=$$PATH:/usr/bin:${.OBJDIR}/../strfile \
+	PATH=$$PATH:/usr/bin:${FORTUNE_OBJ}/strfile \
 	    strfile -Cs ${.ALLSRC} ${.TARGET}
 .endfor
 

usr.bin/fortune/fortune/Makefile

@@ -3,7 +3,7 @@
 
 PROG=	fortune
 MAN=	fortune.6
-CFLAGS+=-DDEBUG -I${.CURDIR}/../strfile
+CFLAGS+=-DDEBUG -I${FORTUNE_SRC}/strfile
 
 .include <bsd.prog.mk>
 

usr.bin/fortune/unstr/Makefile

@@ -3,6 +3,6 @@
 
 PROG=	unstr
 MAN=
-CFLAGS+= -I${.CURDIR}/../strfile
+CFLAGS+= -I${FORTUNE_SRC}/strfile
 
 .include <bsd.prog.mk>