Dissociate controlling tty better on Darwin
* src/process.c (dissociate_controlling_tty): New function. (create_process): Use it to dissociate controlling tty if setsid fails, which happens on Darwin after a vfork (Bug#33154). Do this on all platforms, not just on Darwin, as a similar problem is plausible elsewhere. * src/callproc.c (call_process): Use the new function here, too, for consistency and to avoid duplicate code.
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