Remove configure probe for sys/select.h.

Thomas Munro <tmunro@postgresql.org>

Commit: 7e50b4e3c52aaa13e86e0560d1382844074c9f1b
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2022-08-13T12:09:47Z
Releases: 16.0
Remove configure probe for sys/select.h.

<sys/select.h> is in SUSv3 and every targeted Unix system has it.
Provide an empty header in src/include/port/win32 so that we can
include it unguarded even on Windows.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CA%2BhUKG%2BL_3brvh%3D8e0BW_VfX9h7MtwgN%3DnFHP5o7X2oZucY9dg%40mail.gmail.com

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