Fix msvc and clang C99 builds #108
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The Microsoft compiler doesn't support variable length arrays, so avoid using them there. And seems like there's an issue with clang where
__has_extension(c_atomic)is true even when it's set to use C99, then complains about_Atomicbeing a C11 extension... For this issue, make__STDC_VERSION__ >= 201112La requirement in all cases.