Split out list of XLog resource managers

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

Commit: 5a1cd89f8f4a0bc13c85810de47d48bb6386ea89
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2013-02-06T11:47:28Z
Releases: 9.3.0
Split out list of XLog resource managers

The new rmgrlist.h header, containing all necessary data
about built-in resource managers, allows other pieces of code to
access them.

In particular, this allows a future pg_xlogdump program to extract
rm_desc function pointers, without having to keep a duplicate list of
them.

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