pgsql: Fix overflow check in tm2timestamp (this time for sure).

Fix overflow check in tm2timestamp (this time for sure).

I fixed this code back in commit 841b4a2d5, but didn't think carefully
enough about the behavior near zero, which meant it improperly rejected
1999-12-31 24:00:00. Per report from Magnus Hagander.

Branch
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REL9_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/da5f032a8350a77aeed4f9d459633055f0adb645

Modified Files
--------------
src/backend/utils/adt/timestamp.c | 5 +++--
src/interfaces/ecpg/pgtypeslib/timestamp.c | 5 +++--
2 files changed, 6 insertions(+), 4 deletions(-)

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