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Draft: glamor: use dual source blend on GL 2.1 with ARB_ES2_compatibility

ARB_blend_func_extended may be exposed even without GLSL 1.30. In order to use it we need GLES2 shaders that are available if ARB_ES2_compatibility is exposed.

Signed-off-by: Vasily Khoruzhick anarsoul@gmail.com

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