[Bug 7148] diff -r does not show removed (or new) directories

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7148

--- Comment #5 from iom <iomezk at gmail.com> ---
Created attachment 9016
  --> https://bugs.busybox.net/attachment.cgi?id=9016&action=edit
add directories to the directory listing if -r flag was set, but -N was not

This patch just makes diff to follow diffutils behaviour.
I don't know if diff.c code can be optimized.

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