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Use `cp -c` to copy file into the bundle which uses clonefile instead
of hardlink. This is as efficient in speed and disk usage. This also
ensures that files in the bundle are distinct from any other files
(which is important when running EG2 tests via Xcode as it tries to
overwrite some files with `ditto` which fails if source and target
are hardlinked together).

Bug: 1042182
Change-Id: I53c08a0ee2200355b3c4249465f78189d6e294d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2133930
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756765}