Remove unnecessary includes of <signal.h>

Peter Eisentraut <peter@eisentraut.org>

Commit: dffb2b478f54f4abdd0271bbab44d3f81d017648
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2023-12-04T05:35:22Z
Releases: 17.0
Remove unnecessary includes of <signal.h>

These were once needed for sig_atomic_t, but that no longer appears in
these headers, so the include is not needed.

Reviewed-by: Shubham Khanna <Shubham.Khanna@fujitsu.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/cff5475d-e0a9-4561-b094-794aa36bd031%40eisentraut.org

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