Prevent stack overflow in query-type functions.

Noah Misch <noah@leadboat.com>

Commit: 7bed97d486bda5761ba7e7982e4133aeded6b852
Author: Noah Misch <noah@leadboat.com>
Date: 2015-10-05T14:06:33Z
Releases: 9.5.0
Prevent stack overflow in query-type functions.

The tsquery, ltxtquery and query_int data types have a common ancestor.
Having acquired check_stack_depth() calls independently, each was
missing at least one call.  Back-patch to 9.0 (all supported versions).

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