Bad cp -a behaviour

[Tim Waugh]

When using 'cp -a' to copy a directory structure, it has some
unexpected behaviour.  See the attached Makefile, which compares the
behaviour between tar, cpio, and cp.

The problem seems to be that when a destination file is written it is
done so by opening the file without removing it first.  If it is a
hardlink to a previous destination file from the same command it will
be overwritten.

The original bug report is here:

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=128874

Tim.
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Makefile
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