Diagnose incompatible OpenLDAP versions during build and test.

Noah Misch <noah@leadboat.com>

Commit: fd18965e33da9dc7326803e61cf28d82237e3bba
Author: Noah Misch <noah@leadboat.com>
Date: 2014-07-22T15:01:35Z
Releases: 9.4.0
Diagnose incompatible OpenLDAP versions during build and test.

With OpenLDAP versions 2.4.24 through 2.4.31, inclusive, PostgreSQL
backends can crash at exit.  Raise a warning during "configure" based on
the compile-time OpenLDAP version number, and test the crash scenario in
the dblink test suite.  Back-patch to 9.0 (all supported versions).

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