Drop support for MSVCRT's float formatting quirk.

Commit f1885386 added code to remove an unnecessary leading zero from
the exponent in a float formatted by the system snprintf().  The C
standard doesn't allow unnecessary digits beyond two, and the tests pass
without this on Windows' modern UCRT (required since commit 1758d424).

Discussion: 
https://postgr.es/m/CA%2BhUKGJnmzTqiODmTjf-23yZ%3DE3HXqFTtKoyp3TF-MpB93hTMQ%40mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/6b46669883fac9521c20fe4e2c55ccfbee778591

Modified Files
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src/port/snprintf.c | 27 ---------------------------
1 file changed, 27 deletions(-)

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