Jilles Tjoelker 6b42272163 libc/fts: Use O_CLOEXEC for internal file descriptors.
Because fts keeps internal file descriptors open across calls, making such
descriptors close-on-exec helps not only multi-threaded applications but
also single-threaded applications.

In particular, this prevents passing a temporary file descriptor for saving
the current directory to processes created via find -exec.
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