package/tzdata: new package

This is the time zone database, used by glibc for translations between
UTC and local time.

Signed-off-by: Richard Braun <rbraun@sceen.net>
[yann.morin.1998@free.fr: use global ZIC, install posix TZ only once]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Danomi Manchego <danomimanchego123@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>