Add stressfs and gdbutil to dist

Makefile

@@ -167,15 +167,16 @@ qemu-gdb-nox: fs.img xv6.img .gdbinit
 # check in that version.
 
 EXTRA=\
-	mkfs.c ulib.c user.h cat.c echo.c forktest.c grep.c\
-	kill.c ln.c ls.c mkdir.c rm.c usertests.c wc.c zombie.c\
-	printf.c umalloc.c \
+	mkfs.c ulib.c user.h cat.c echo.c forktest.c grep.c kill.c\
+	ln.c ls.c mkdir.c rm.c stressfs.c usertests.c wc.c zombie.c\
+	printf.c umalloc.c\
 	README dot-bochsrc *.pl toc.* runoff runoff1 runoff.list\
+	.gdbinit.tmpl gdbutil\
 
 dist:
 	rm -rf dist
 	mkdir dist
-	for i in $(FILES) .gdbinit.tmpl; \
+	for i in $(FILES); \
 	do \
 		grep -v PAGEBREAK $$i >dist/$$i; \
 	done