Use shuffle+add instead of vector subscripting in SSE2 Adler-32
Use shuffle+add instead of vector subscripting in SSE2 Adler-32

Shuffle+add is more efficient and also works on gcc versions that don't
support subscripting of vector types (pre-4.6).

ebiggers/libdeflate,ebiggers/libdeflate,ebiggers/libdeflate