Thread: pgsql-server: Rewrite identify_system_timezone() to give it

Log Message:
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Rewrite identify_system_timezone() to give it better-than-chance odds
of correctly identifying the system's daylight-savings transition rules.
This still begs the question of how to look through the zic database to
find a matching zone definition, but at least now we'll have some chance
of recognizing the match when we find it.

Modified Files:
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    pgsql-server/src/timezone:
        pgtz.c (r1.13 -> r1.14)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/timezone/pgtz.c.diff?r1=1.13&r2=1.14)