executor: make errors during thread creation exit zero

On OpenBSD, the executor sometimes manages to set the memory resource
limit 0 causing any following memory allocation to fail. Since threads
are potentially created from such a thread which cannot allocate any
memory, the executor will exit non-zero which in turn will cause
false-positive panics to be reported. For more info see the
discussion[1] in PR #1243.

Instead, if hitting a fatal error during thread creation exit zero.

[1] https://github.com/google/syzkaller/pull/1243

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