Mac: Fix bug that has always existed in the GYP build where O3D.rsrc was an empty file with all the data stored in the resource fork (which is lost when zipping). -useDF was in the ancient scons build but was never included in the GYP command.
Mac: Fix bug that has always existed in the GYP build where O3D.rsrc was an empty file with all the data stored in the resource fork (which is lost when zipping). -useDF was in the ancient scons build but was never included in the GYP command.

TEST=built on Mac, verified O3D.rsrc file is now correct, and verified it works in various browsers
BUG=none

Review URL: http://codereview.chromium.org/2384003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@48524 0039d316-1c4b-4281-b951-d872f2087c98

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