Remove SHM_QUEUE

Andres Freund <andres@anarazel.de>

Commit: d137cb52cb7fd44a3f24f3c750fbf7924a4e9532
Author: Andres Freund <andres@anarazel.de>
Date: 2023-01-20T02:55:51Z
Releases: 16.0
Remove SHM_QUEUE

Prior patches got rid of all the uses of SHM_QUEUE. ilist.h style lists are
more widely used and have an easier to use interface. As there are no users
left, remove SHM_QUEUE.

Reviewed-by: Thomas Munro <thomas.munro@gmail.com> (in an older version)
Discussion: https://postgr.es/m/20221120055930.t6kl3tyivzhlrzu2@awork3.anarazel.de
Discussion: https://postgr.es/m/20200211042229.msv23badgqljrdg2@alap3.anarazel.de

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