Improve includes introduced in the replication origins patch.

Andres Freund <andres@anarazel.de>

Commit: 3a145757a0cd19bfce770abeefa16af674e1bc09
Author: Andres Freund <andres@anarazel.de>
Date: 2015-08-06T10:41:46Z
Releases: 9.6.0
Improve includes introduced in the replication origins patch.

pg_resetxlog.h contained two superfluous includes, origin.h superfluously
depended on logical.h, and pg_xlogdump's rmgrdesc.h only indirectly
included origin.h.

Backpatch: 9.5, where replication origins were introduced.

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