libc/stdtime: Sync with tzcode2013i from ftp://ftp.iana.org/tz/releases

The compile-time flag NOSOLAR has been removed, as nowadays the
benefit of slightly shrinking runtime table size is outweighed by the
cost of disallowing potential future updates that exceed old limits.
zic(8): Sync with tzcode2013i from ftp://ftp.iana.org/tz/releases

See https://github.com/eggert/tz/blob/master/NEWS for a list of
what changed. We were previously in sync with tzcode2012c.
Sync zoneinfo database with tzdata2013i from ftp://ftp.iana.org/tz/releases

See https://github.com/eggert/tz/blob/master/NEWS for a list of
what changed. We were previously in sync with tzdata2013d.