Blend equation advanced

Merged Elie Tournier requested to merge hopetech/virglrenderer:blend-equation-advanced into master

The host can support KHR_blend_equation_advanced but not EXT_shader_framebuffer_fetch. In this case, we didn't lower the blend equation to fbfetch in the guest, pass the blend value to the host and recreate the shader with blend equation in the host.

Mesa part: mesa/mesa!5516 (merged)

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