executor: skip setsid() for threaded reproducers

Lately, I've been looking into why such low amount of syz reproducers on
OpenBSD are turned into C reproducers. One thing I did notice is that
such syz reproducers have one thing in common: they use the
threaded=true and sandbox=none parameters. Such C reproducer always
exits non-zero early on since the call to setsid() fails with EPERM.
Meaning, the calling process is already a process group leader.

Not sure if the preprocessor conditional should be tweaked in order to
avoid unwanted side effects on other BSDs or configurations.

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