Put back <float.h> in a few files that need it for _isnan().

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 86dbbf20d8496ede77566873d1e22cd11c1e544c
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-03-08T20:38:34Z
Releases: 10.0
Put back <float.h> in a few files that need it for _isnan().

Further fallout from commit c29aff959: there are some files that need
<float.h>, and were getting it from datatype/timestamp.h, but it was not
apparent in my (tgl's) testing because the requirement for <float.h>
exists only on certain Windows toolchains.

Report and patch by David Rowley.

Discussion: https://postgr.es/m/CAKJS1f-BHceaFzZScFapDV48gUVM2CAOBfhkgffdqXzFb+kwew@mail.gmail.com

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