The patches are at [0]. They are free (no blobs inside, they modify GPL2-licensed files with the original patches having Signed-off-by).
The script included in that repo uses blobbed kernel sources. A proper solution would be to apply the patches to Linux-libre kernel sources and build it, Jason Self wrote that he will do it for next freesh kernel updates. [0] https://github.com/raouldc/c720-touchpad-patches/
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