Tests: TestProcFs cannot assume stdin/stdout/stderr are the same

If someone runs the test with shell redirection going on, or in a way
that changes any of the standard file descriptors this assumption will
not hold. When running from a terminal normally, it is true however.

Instead, check that /proc/self/fd/[0,1,2] are symlinks, and can be
stat-d by verifying that both stat and lstat succeed, and give different
struct stat contents.

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