Add "__builtins__" to the list of predefined names.
Add "__builtins__" to the list of predefined names.

RonnyPfannschmidt/pyflakes-old,kevinw/pyflakes,AlekhyaMallina-Vedams/pyflakes,sanzinger/pyflakes,rounds/pyflakes,RonnyPfannschmidt-Attic/pyflakes-old