Cleanup of GiST extensions in contrib/: now that we always invoke GiST

Neil Conway <neilc@samurai.com>

Commit: 36ab6005119532903d4ce3ad564e6576bd7698b8
Author: Neil Conway <neilc@samurai.com>
Date: 2005-05-21T12:08:06Z
Releases: 8.1.0
Cleanup of GiST extensions in contrib/: now that we always invoke GiST
methods in a short-lived memory context, there is no need for GiST methods
to do their own manual (and error-prone) memory management.

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