package/tzdata: install missing files

Install two additional files:
  - zone.tab   : {country-code,coordinates,timezone} tuples
  - iso3166.tab: {country-code,country} tuples

[Peter: simplify copy handling]
Reported-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>