zoneinfo: also install tzdata.zi and version

Build and install the shrunk version of the time zone database required
by libc++ 19 std::chrono::current_zone (etc). While here, also install
the tzdata 'version' file to align more closely with other vendors.

PR: 282377
Reviewed by: dim, emaste, imp
Differential Revision: https://reviews.freebsd.org/D49577