DXVK requires dualSrcBlend for D3D11 and skips any GPU without it, so on
Mali through Venus no adapter was found. The Mali compatibility layer now
reports the feature and maxFragmentDualSrcAttachments 1, keeps it out of
the driver's device, turns fragment outputs decorated Index 1 into Private
variables (shader modules and inline stage code), and maps SRC1 blend
factors to source alpha in pipelines and vkCmdSetColorBlendEquationEXT.
Only active when the driver lacks the feature.
Adds a mock loader and driver test for the layer, and fetches the
layer's pinned headers for it in CI.
maxjivi05
463ba9ef79