The problem fixed by this patch is that this script always creates a link
to itself in the target location. That behavior was probably not intended
and caused problems when running this script several times with the same
target folder. Each run of this script would create one expected link and
one link to the script itself. Meaning that the need to use --force the
second time was needed to overwrite the "self-link" from the first run.
Even with --force there were issues if this script was run in parallel
since there can be a race condition in overwriting the "self-link".
Review URL: https://chromiumcodereview.appspot.com/16096006
git-svn-id: http://src.chromium.org/svn/trunk/src/build@202661 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
mostynb@opera.com
phajdan.jr@chromium.org