[master] remove __pycache__ directory with distclean
(reported by emhn: left over after a distclean) Some of the makefiles clear that but not that one. We do automate the distclean (via distcheck) as part of our buildfarm. But I think this __pycache__ was introduced in python3.2 and those build systems don't have it. This is trivial so didn't get review.
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