test: add missing sbin/task.sh to skeleton dist.
SUBDIRS = common tenv
EXTRA_DIST = skel/bin/busybox-x86_64.md5 skel/sbin/service.sh skel/bin/slay \
+ skel/sbin/task.sh \
skel/cdrom/.empty skel/dev/shm/.empty skel/dev/pts/.empty \
skel/etc/inittab skel/etc/hostname skel/etc/fstab \
skel/etc/init.d/rcS skel/etc/init.d/rcK skel/tmp/.empty \
