pwarp - simd_spu fixes

[Jules Bergmann]

Somehow I managed to break lots of bits in simd_spu.hpp at the very last 
minute before committing -- and I thought I tested this!

I also appear to have missed checking in my changelog.

Patch applied.

				-- Jules
-- 
Jules Bergmann
CodeSourcery
jules at codesourcery.com
(650) 331-3385 x705
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