Add GL_EXT_secondary_color

src/mesa/drivers/dri/unichrome/via_context.c

@@ -256,6 +256,7 @@ static const char * const card_extensions[] =
    "GL_EXT_texture_env_combine",
    "GL_EXT_texture_env_dot3",
    "GL_EXT_texture_lod_bias",
+   "GL_EXT_secondary_color",
    "GL_NV_blend_square",
    NULL
 };