makefs: tidy up reach-over source

- cd9660 relies on an #include "iso.h" but does not build any .c files
  out of source, so remove reach-over .PATH
- ffs does not rely on any sys/ headers, so remove -I from CFLAGS.
- ffs_tables from sys/ is used by ffs; move the SRCS entry from the top-
  level Makefile to ffs' Makefile.inc.

Sponsored by:	The FreeBSD Foundation

usr.sbin/makefs/Makefile

@@ -29,9 +29,6 @@ SRCS+=	getid.c misc.c spec.c
 CFLAGS+=-I${SRCTOP}/contrib/mknod
 SRCS+=	pack_dev.c
 
-.PATH:	${SRCTOP}/sys/ufs/ffs
-SRCS+=	ffs_tables.c
-
 CFLAGS+=	-I${SRCTOP}/lib/libnetbsd
 LIBADD=		netbsd util sbuf
 

usr.sbin/makefs/cd9660/Makefile.inc

@@ -1,7 +1,7 @@
 #	$FreeBSD$
 #
 
-.PATH:	${SRCDIR}/cd9660 ${SRCTOP}/sys/fs/cd9660/
+.PATH:	${SRCDIR}/cd9660
 
 CFLAGS+=-I${SRCTOP}/sys/fs/cd9660/
 

usr.sbin/makefs/ffs/Makefile.inc

@@ -2,8 +2,8 @@
 #
 
 .PATH:	${SRCDIR}/ffs ${SRCTOP}/sys/ufs/ffs
-
-CFLAGS+=	-I${SRCTOP}/sys/ufs/ffs
-
 SRCS+=	ffs_alloc.c ffs_balloc.c ffs_bswap.c ffs_subr.c ufs_bmap.c
 SRCS+=	buf.c mkfs.c
+
+# Reach-over source from sys/ufs/ffs
+SRCS+=	ffs_tables.c