Fix timestamptz_in so that parsing of 'now'::timestamptz gives right

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 2bba78d605d8f71f5e60c63ea66afa43d4e24280
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2003-02-20T05:25:25Z
Releases: 7.3.3
Fix timestamptz_in so that parsing of 'now'::timestamptz gives right
answer when SET TIMEZONE has been done since the start of the current
transaction.  Per bug report from Robert Haas.
I plan some futher cleanup in HEAD, but this is a low-risk patch for
the immediate issue in 7.3.

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