[librpcpu] Improve ifunc dispatch functions #216
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There are now separate
*_HAS_IFUNC
defines for each component that uses SIMD optimizations, similarly to the*_HAS_SSE*
defines. This ensures that ifunc is only used when a given component has SIMD optimizations for the target architecture, and allows SIMD optimizations for a given architecture to be added for some functions, but not others.This replaces PR #139.