Un-break ecpg test suite under --disable-integer-datetimes.

Noah Misch <noah@leadboat.com>

Commit: 08c8e8962f56c23c6799178d52d3b31350a0708f
Author: Noah Misch <noah@leadboat.com>
Date: 2014-05-08T23:29:02Z
Releases: 9.4.0
Un-break ecpg test suite under --disable-integer-datetimes.

Commit 4318daecc959886d001a6e79c6ea853e8b1dfb4b broke it.  The change in
sub-second precision at extreme dates is normal.  The inconsistent
truncation vs. rounding is essentially a bug, albeit a longstanding one.
Back-patch to 8.4, like the causative commit.

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