In pg_upgrade, disallow migration of 8.3 clusters using contrib/ltree

Bruce Momjian <bruce@momjian.us>

Commit: 8cdd62068d2b6913902741f2fbc74d51042c3d3e
Author: Bruce Momjian <bruce@momjian.us>
Date: 2011-09-07T18:43:07Z
Releases: 9.1.0
In pg_upgrade, disallow migration of 8.3 clusters using contrib/ltree
because its internal format was changed in 8.4.

Backpatch to 9.0 and 9.1.

Report by depesz, diagnosis by Tom.

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