fix error returned from readdir_r when isolation is enabled, and uses of raw_os_error #3995
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In #3779 @oli-obk noticed that our
readdir_r
is buggy -- it shouldn't ever set errno, but the "isolation enabled" path used the shared helper that sets errno.So this PR fixes that. I think that is the only part of #3779 that intentionally changes behavior.
I also noticed some uses of raw_os_error, which is buggy since it returns host error codes that we can't just use for the target.