Remove contrib version of rtree_gist --- now in core system.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: e6a8eba3f2157bca9871539e6be1ca2399c1371e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-07-01T19:23:07Z
Releases: 8.1.0
Remove contrib version of rtree_gist --- now in core system.

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