Refactor SIMD ifdefs#797
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The extconf check if SIMD is available, but then later on the `simd.h` header has extra logic to decide if it uses it or not. e.g. for SSE2 we have: ``` if defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64) || defined(_M_X64) || defined(_M_AMD64) ``` Which exclude i686 builds. Hence if we're not entering that `#if` we can end up with `JSON_ENABLE_SIMD=1` but neither `HAVE_SIMD_NEON` nor `HAVE_SIMD_SSE2`. So instead of relying on `JSON_ENABLE_SIMD` to check if any SIMD implementation is available, this commit introduce `HAVE_SIMD`.
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The extconf check if SIMD is available, but then later on the
simd.hheader has extra logic to decide if it uses it or not.e.g. for SSE2 we have:
Which exclude i686 builds.
Hence if we're not entering that
#ifwe can end up withJSON_ENABLE_SIMD=1but neitherHAVE_SIMD_NEONnorHAVE_SIMD_SSE2.So instead of relying on
JSON_ENABLE_SIMDto check if any SIMD implementation is available, this commit introduceHAVE_SIMD.FYI: @hsbt @samyron