tests: support stderr verification with returns_() * tests/init.sh (returns_): Disable tracing for this wrapper function, so that stderr of the wrapped command is unchanged, allowing for verification of the contents.

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−#include <stddef.h>
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−struct savewd;
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−ptrdiff_t mkancesdirs (char *, struct savewd *,
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−                       int (*) (char const *, char const *, void *), void *);