Fix Paeth Filter decode on platforms that do not support Ssse3

[JimBobSquarePants]

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Description

Fixes #2617

[cmeeren]

Just to check, did you intend to name it Ssse3 (three s-es?) I see it was Sse2 (two s-es). I don't know these terms, though.

[JimBobSquarePants]

Just to check, did you intend to name it Ssse3 (three s-es?) I see it was Sse2 (two s-es). I don't know these terms, though.

Yes, the method uses the Abs intrinsic from Supplemental Streaming SIMD Extensions 3 (Ssse3)