fix for issue #234 - the framebuffers for side-by-side and top/bottom had alpha channels. so when sprites with alpha were blended into the framebuffer it would blend the sprite pixel alpha with the fb pixel alpha

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[patterns]

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**.h = native

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**.c = native

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**.cpp = native

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**.lua = native

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**.txt = native

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**.pas = native

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**.inc = native

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**.hs = native