pgsql: Enable thread safety Enable thread safety on all platforms.

Log Message:
-----------
Enable thread safety

Enable thread safety on all platforms.  This will either be followed up
by a more extensive patch, or reverted, depending on the build farm
results.

Modified Files:
--------------
    pgsql:
        configure (r1.659 -> r1.660)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.659&r2=1.660)
        configure.in (r1.613 -> r1.614)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.613&r2=1.614)