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Skip is_closing() check when not available.
bitcoin#13715 introduced a new check for _transport.is_closing() in mininode's P2PConnection's. This function is only available from Python 3.4.4, though, while Bitcoin is supposed to support all Python 3.4 versions. In this change, we make the check conditional on is_closing() being available. If it is not, then we revert to the behaviour before the check was introduced; this means that bitcoin#13579 is not fixed for old systems, but at least the tests work as they used to do before. This includes a small refactoring from a one-line lambda to an inline function, because this makes the code easier to read with more and more conditions being added. Fixes bitcoin#13745.
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