arb_blend_func_extended: add GL_ARB_ES2_compatibility support
lima driver exposes GL_ARB_blend_func_extended, but it has no GL_EXT_gpu_shader4 support. The only way to use it in GL is by using GLES2 shaders.
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lima driver exposes GL_ARB_blend_func_extended, but it has no GL_EXT_gpu_shader4 support. The only way to use it in GL is by using GLES2 shaders.