Thread: pgsql-server: Fix mingw link check by using double-brackets.

Log Message:
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Fix mingw link check by using double-brackets.

Modified Files:
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    pgsql-server:
        configure (r1.372 -> r1.373)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/configure.diff?r1=1.372&r2=1.373)
        configure.in (r1.361 -> r1.362)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/configure.in.diff?r1=1.361&r2=1.362)