Python 3.4+: use os.set_inheritable + os.set_blocking in place of unreadable fcntl calls #3210
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We should cleanup those rather unreadable low-level fcntl calls. The stdlib provides single-call functions for these now.
(Replacement is not 100% equivalent, as they might call
ioctl(.., FIO.., NULL)
instead, but I see no reason we should care.)Suggested order: Merge #3211 and #3127 before this one