remove catcache.h from syscache.h

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

Commit: fda0594fc2f4c98ee50ea02fa196ca51db81ea70
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2012-08-28T22:36:39Z
Releases: 9.3.0
remove catcache.h from syscache.h

Instead, place a forward struct declaration for struct catclist in
syscache.h.  This reduces header proliferation somewhat.

Files