[NetBSD] cmdline() raise ZombieProcess when unable to decode chars #1536
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This happens with unicode test, meaning the C routine it's unable to decode the unicode chars. Also, fix a bug introduced in 1530 (C impl of cwd()) which does not take ENOENT into account.
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...from C we get EINVAL, which is then (erroneously) turned into ZombieProcess since the PID is still alive. Instead return an empty list. This was exercised by (invalid chars) unicode tests.