btest: assign $stderr = STDOUT instead of IO#reopen to be more portable #5255
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`IO#reopen` internally uses dup syscall but some platforms don't support the syscall. re-assigning `$stderr` is enough to capture the interpreter's errors and warnings.
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IO#reopeninternally uses dup syscall but some platforms don't supportthe syscall. re-assigning
$stderris enough to capture the interpreter'serrors and warnings. In this way, dup is unnecessary.