Move RelFileNumber declarations to common/relpath.h.

Robert Haas <rhaas@postgresql.org>

Commit: 2f47715cc8649f854b1df28dfc338af9801db217
Author: Robert Haas <rhaas@postgresql.org>
Date: 2022-09-27T16:01:57Z
Releases: 16.0
Move RelFileNumber declarations to common/relpath.h.

Previously, these were declared in postgres_ext.h, but they are not
needed nearly so widely as the OID declarations, so that doesn't
necessarily make sense. Also, because postgres_ext.h is included
before most of c.h has been processed, the previous location creates
some problems for a pending patch.

Patch by me, reviewed by Dilip Kumar.

Discussion: http://postgr.es/m/CA+TgmoYc8oevMqRokZQ4y_6aRn-7XQny1JBr5DyWR_jiFtONHw@mail.gmail.com

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