Drop mesa from 'patched' check
Mesa tickled down into pureos-amber and from 19.3 we don't need patches for basic funtionality anyway so let's drop that check to make imx6 and qemu images simpler.
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Mesa tickled down into pureos-amber and from 19.3 we don't need patches for basic funtionality anyway so let's drop that check to make imx6 and qemu images simpler.