Don't include proc.h in shm_mq.h

Álvaro Herrera <alvherre@kurilemu.de>

Commit: a2c89835f5124f9a98edffd953f42639bf9a31b5
Author: Álvaro Herrera <alvherre@kurilemu.de>
Date: 2026-02-27T09:53:47Z
Don't include proc.h in shm_mq.h

This prevents proliferation of proc.h to tons of other places; shm_mq.h
is widely included.

Discussion: https://postgr.es/m/202602261733.s2rkxezwuif6@alvherre.pgsql

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