arb_framebuffer_object: add missing MSAA alpha-to-coverage and alpha-to-one tests
The missing test is the one that enables both alpha-to-coverage and alpha-to-one. It currently fails on AMD drivers, but passes on llvmpipe.
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The missing test is the one that enables both alpha-to-coverage and alpha-to-one. It currently fails on AMD drivers, but passes on llvmpipe.