to_char: revert cc0d90b73b2e6dd2f301d46818a7265742c41a14

Bruce Momjian <bruce@momjian.us>

Commit: 33a2c5ecd60a2cf68cfcdd37916f3989bb956581
Author: Bruce Momjian <bruce@momjian.us>
Date: 2015-03-23T02:56:56Z
Releases: 9.5.0
to_char:  revert cc0d90b73b2e6dd2f301d46818a7265742c41a14

Revert "to_char(float4/8):  zero pad to specified length".  There are
too many platform-specific problems, and the proper rounding is missing.
Also revert companion patch 9d61b9953c1489cbb458ca70013cf5fca1bb7710.

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