coreutils: fix chroot installation

coreutils: fix chroot installation

Since commit 256bb383fb7 (coreutils: use single binary in symlink
method) the chroot move command creates a dangling symlink, because the
symlink target is 'coreutils' which is not in the /usr/sbin/ directory.
Instead of moving, remove the coreutils installed symlink, and create a
new one in $(TARGET_DIR)/usr/sbin with the correct target.

Should also fix (busybox):
http://autobuild.buildroot.net/results/6b3/6b39648b466738162516aa50ab328d839ec85448/

Cc: Carlos Santos <casantos@datacom.ind.br>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>