Any supplementary agreement entered into pursuant to Article VI of the Compact and requiring the expenditure of funds or the assumption of an obligation to expend funds shall not become effective as to this state prior to the making of an appropriation therefor by the Legislature. Provided, that with respect to the payment of this state's share of the budget of expenditures for the maintenance of the Board as provided in Article III(b) of the Compact, the Governor may, in the absence of a specific legislative appropriation for such purpose, use appropriations as are made available to him for emergency and contingency expenditures.