Explicitly chdir when building snapshot kernels and their associated

tarballs.  In a related effort, do everything that has a different chdir
root (ie, config && make depend etc) in a subshell.
Thanks to Hans for the initial prompting on this.

src/etc/etc.mac68k/Makefile.inc

@@ -1,19 +1,21 @@
-#	$OpenBSD: Makefile.inc,v 1.4 1997/10/06 20:10:52 gene Exp $
+#	$OpenBSD: Makefile.inc,v 1.5 1998/02/16 02:04:39 gene Exp $
 #	etc.mac68k/Makefile.inc -- mac68k-specific etc Makefile targets
 
 .ifdef DESTDIR
 snap_md: bsd-generic bsd-genericsbc
-	tar cf - ${.CURDIR}/../sys/arch/mac68k/compile/GENERIC/bsd \
-	| ${GZIP} ${GZIPFLAGS} >${DESTDIR}/snapshot/bsd-generic.tar${GZIPEXT}
-	tar cf - ${.CURDIR}/../sys/arch/mac68k/compile/GENERICSBC/bsd \
-	| ${GZIP} ${GZIPFLAGS} >${DESTDIR}/snapshot/bsd-genericsbc.tar${GZIPEXT}
+	(cd ${.CURDIR}/../sys/arch/mac68k/compile/GENERIC;
+	 tar cf - bsd \
+	 | ${GZIP} ${GZIPFLAGS} >${DESTDIR}/snapshot/bsd-generic.tar${GZIPEXT})
+	(cd ${.CURDIR}/../sys/arch/mac68k/compile/GENERICSBC;
+	 tar cf - bsd \
+	 | ${GZIP} ${GZIPFLAGS} >${DESTDIR}/snapshot/bsd-genericsbc.tar${GZIPEXT})
 bsd-generic:
-	cd ${.CURDIR}/../sys/arch/mac68k/conf && config GENERIC
-	cd ${.CURDIR}/../sys/arch/mac68k/compile/GENERIC && \
-	    make clean && make depend && make
+	(cd ${.CURDIR}/../sys/arch/mac68k/conf && config GENERIC)
+	(cd ${.CURDIR}/../sys/arch/mac68k/compile/GENERIC && \
+	    make clean && make depend && make)
 bsd-genericsbc:
-	cd ${.CURDIR}/../sys/arch/mac68k/conf && config GENERICSBC
-	cd ${.CURDIR}/../sys/arch/mac68k/compile/GENERICSBC && \
-	    make clean && make depend && make
+	(cd ${.CURDIR}/../sys/arch/mac68k/conf && config GENERICSBC)
+	(cd ${.CURDIR}/../sys/arch/mac68k/compile/GENERICSBC && \
+	    make clean && make depend && make)
 
 .endif	# DESTDIR check