pgsql: It's clearly now pointless to do backwards compatible parsing of

Log Message:
-----------
It's clearly now pointless to do backwards compatible parsing of this,
since we released a version without it, so remove the comment that
says we might want to do that.

Modified Files:
--------------
    pgsql/src/backend/libpq:
        hba.c (r1.198 -> r1.199)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/libpq/hba.c?r1=1.198&r2=1.199)