buildroot

tzdata: reorder zone list to avoid missing links

The 'backward' zone references entries from other zones (e.g. Pacific/*)
that have not yet been compiled, leading to missing links. To fix this,
take-over the zone list sort order from upstream 'tzdata' and also ensure
that make fails if zic terminates with a non-zero exit code.

Signed-off-by: Michel Marti <mma@objectxp.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>