image_version: use file instead symlink

Using symlink causes issues when getting the sysroot tarball with
ade toolset in SDK, as it cannot be properly extracted from it.

Signed-off-by: Héctor Orón Martínez <hector.oron@collabora.co.uk>

scripts/setup_image_version.chroot

@@ -8,7 +8,6 @@ rel=$2
 timestamp=$3
 vendor=$4
 
-echo "${distro} ${rel} ${timestamp} ${vendor}" > /usr/lib/image_version
-ln -sf ../usr/lib/image_version /etc/image_version
+echo "${distro} ${rel} ${timestamp} ${vendor}" > /etc/image_version
 
 shopt -u