Now that the calendar has turned the page to February, the Academy Awards are approaching. And that means TCM, once again, is preceding the ceremony with its “31 Days of Oscar’’ lineup. That’s why the month, in prime time, begins with 1965’s Doctor Zhivago, David Lean’s epic retelling of the Boris Pasternak romance novel, set against the real-life political events of WWI and the Russian Revolution. Omar Sharif, Julie Christie and Geraldine Chaplin st