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panfrost: Emulated RGTC support

Icecream95 requested to merge icecream95/mesa:rgtc into master

For most GPUs RGTC is disabled, so it needs to be emulated, using the fake_rgtc option of u_transfer_helper.

Passes the rgtc-teximage-01 and rgtc-teximage-02 piglit tests.


With this, only NV_conditional_render and ARB_texture_buffer_object will be needed for GL 3.1 to be exposed by default.

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