Use POSIX_SPAWN_CLOEXEC_DEFAULT in posix_spawn.c when available #254
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I'm looking at improving performance when
close_fds=Trueafter encountering #189.I noticed this could be improved on MacOS where this flag is available. Making the
do_spawn_posixfunction handle more situations will result in fewer fallbacks to the (possibly less performant)do_spawn_fork.I haven't tested this yet, hoping to see how it works on CI.