VIENNA — When Arnold Schwarzenegger declared “I’ll be back” at the end of the first Terminator film, very few thought he was talking about returning to Austria. Yet here in Vienna, where Schwarzenegger made a surprise trip this week, there is speculation that his political career will be resurrected – Lazarus-like – in his abandoned homeland. And if he does take the leap, the Terminator could find himself playing a walk-on part in the most grandiose story of his career: the breakdown of the postwar European political order.