[issue24924] _posixsubprocess.c: sysconf() might not be async-signal-safe

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[issue24924] _posixsubprocess.c: sysconf() might not be async-signal-safe

New submission from Jakub Wilk: The safe_get_max_fd() (in Modules/_posixsubprocess.c) is documented to be async-signal-safe. However, this function calls sysconf(). sysconf() was guaranteed to be async-singal-safe in SUSv3, but it's no longer in SUSv4. I don't think it's going to be a problem