[patch] Fix linux readlink of dead link

[Tijl Coosemans]

Hi,

Can you review the attached patch?  Currently kern_alternate_path follows
symbolic links which means it fails to return the alternate path if it's
a dead link.  This means syscalls like readlink and lstat fail on a dead
link that exists under /compat/linux but not under /.  I also think it's
better to report an error to applications that try to open such a path
instead of ignoring the link and trying the path under /.
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