GLOBAL MARKETS-Steady stocks eye central banks; crude falls

* Brent at 1-month low as Libyan supply returns; WTI falls the most since late May * Alcoa's beat boosts Wall Street stocks * Euro edges up versus dollar (Updates prices, adds crude oil comment) By Rodrigo Campos NEW YORK, July 9 (Reuters) - A global stocks index was little changed on Wednesday ahead of key central bank news, while Brent fell as Libyan pumps came back online. Markets were looking ahead to a speech by European Central Bank President Mario Draghi, scheduled f