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Overriding the 'product_dir' of target libdart_dependency_helper was previously removed because of a build failure of Dartium on Mac when building with ninja. Removal of this override caused the ARM cross-compile to fail. The change here achieves the same end as the 'product_dir' override by creating two separate targets for the host and target architectures, and works on Mac and Linux with ninja and make. R=iposva@google.com, kustermann@google.com Review URL: https://codereview.chromium.org//14359014 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@22139 260f80e4-7a28-3924-810f-c04153c831b5