* Use jsimd_i386.c instead of the attic jsimd.c * Corrected include of jsimd.h in jsimd_i386.c.
The SIMD glue code has gotten a bit #ifdef heavy so clean it up by having one file for each possible SIMD arch. This also allows a simplification of the x86_64 code as SSE/SSE2 is always known to exist on that arch.