Removed test case using nan as float value because printf's output for nan is

Michael Meskes <meskes@postgresql.org>

Commit: 822697a26e49db966e1c4190e30befe4794da0cc
Author: Michael Meskes <meskes@postgresql.org>
Date: 2010-01-06T11:59:52Z
Releases: 9.0.0
Removed test case using nan as float value because printf's output for nan is
OS specific with some distinguishing between signaling and quiet nans. It's not
really importnat for us here anyway.

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