Allow non-btree unique indexes for matviews

We were rejecting non-btree indexes in some cases owing to the
inability to determine the equality operators for other index AMs;
that problem no longer exists, because we can look up the equality
operator using COMPARE_EQ.

Stop rejecting these indexes, but instead rely on all unique indexes
having equality operators.  Unique indexes must have equality
operators.

Author: Mark Dilger <[email protected]>
Discussion: https://www.postgresql.org/message-id/flat/[email protected]

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