Pin the built-in index access methods.

This was overlooked in commit 473b93287, which introduced DROP ACCESS
METHOD.  Although that command is restricted to superusers, we don't want
even superusers dropping the built-in methods; "DROP ACCESS METHOD btree"
in particular is unrecoverable from.  Pin these objects in the same way
that other initdb-created objects are pinned.

I chose to bump catversion for this fix.  That's not absolutely necessary
perhaps, but it will ensure that no 9.6 production systems are missing
the pin entries.

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