automake: Convert dricore building to automake.
This is performed in a subdirectory to avoid needing to convert all of src/mesa/Makefile in one go. I can now cherry-pick a commit containing glapi XML changes, do "(cd src/mapi/glapi/gen && make) && make", and get a working driver. Reviewed-by: Matt Turner <firstname.lastname@example.org> Reviewed-by: Kenneth Graunke <email@example.com>
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