Remove mark/restore support in GIN and GiST indexes.

Teodor Sigaev <teodor@sigaev.ru>

Commit: 77db9d9ff21c539499b74216099678dad91ab334
Author: Teodor Sigaev <teodor@sigaev.ru>
Date: 2008-10-20T13:39:44Z
Releases: 8.4.0
Remove mark/restore support in GIN and GiST indexes.
Per Tom's comment.
Also revome useless GISTScanOpaque->flags field.

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