Improve symlink replacement on install
Improve symlink replacement on install

When something is changed from a symlink to a non-symlink, then we
should remove the target before copying it.

Change-Id: Ia7f58569f130a65f4b0f046423ec141af9fbe0fa
Signed-off-by: David Kilroy <159cd46f289d7961b38b0171b53c05be4aaef0b6@arm.com>

ARM-software/bob-build,ARM-software/bob-build,ARM-software/bob-build,ARM-software/bob-build,ARM-software/bob-build