rquota_xdr compilation fixes for AIX (hopefully won't break other OSes).
rquota_xdr compilation fixes for AIX (hopefully won't break other OSes).

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot