Fix up several contrib modules that were using varlena datatypes in not-so-obvious

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

Commit: 9f652d430fbd1e757caaec9fe64d3e94c8693158
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-02-28T22:44:38Z
Releases: 8.3.0
Fix up several contrib modules that were using varlena datatypes in not-so-obvious
ways.  I'm not totally sure that I caught everything, but at least now they pass
their regression tests with VARSIZE/SET_VARSIZE defined to reverse byte order.

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