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support.print_warning() now stores the original value of sys.__stderr__ and uses it to log warnings. libregrtest uses the same stream to log unraisable exceptions and uncaught threading exceptions. Partially revert commit dbe213de7ef28712bbfdb9d94a33abb9c33ef0c2: libregrtest no longer replaces sys.__stdout__, sys.__stderr__, and stdout and stderr file descriptors. Remove also a few unused imports in libregrtest.