Break compilation on SGX and 32-bit x86 without SSE (fixes #41) #44
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A possible fix for #41.
Unfortunately this would break compilation for 32-bit targets without SSE, a few of which would support CPUID. Proper runtime detection would look like https://doc.rust-lang.org/stable/src/core/up/up/stdarch/crates/core_arch/src/x86/cpuid.rs.html#110-156, but needs C again, to accomplish it on stable Rust.