[COMMITTERS] pgsql: Require a specific Autoconf version, instead of a lower bound

[Peter Eisentraut]

Log Message:
-----------
Require a specific Autoconf version, instead of a lower bound only.

Modified Files:
--------------
    pgsql:
        configure.in (r1.537 -> r1.538)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.537&r2=1.538)

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