Reduce some rel.h inclusions, and add pg_list.h to pg_proc_fn.h.

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 0f864a63ea532a475490d4259608385ad717280c
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2008-12-12T22:56:00Z
Releases: 8.4.0
Reduce some rel.h inclusions, and add pg_list.h to pg_proc_fn.h.

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