intel: Add support for i945g to intel_stub_gpu.

I wanted to check the impact of nir-to-tgsi on the i915g driver, but I
don't have an i915 set up.  Similarly, for driconf refactoring I needed to
make sure that classic i915_dri.so still loaded.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6868>
2 files changed