Remove unused tzn arguments for timestamp2tm()

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/531e60aec02fa14d02185e42363b2277427e2119

Modified Files
--------------
src/backend/utils/adt/date.c      |    9 +++------
src/backend/utils/adt/timestamp.c |   26 ++++++++++----------------
2 files changed, 13 insertions(+), 22 deletions(-)

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