Fix 'extended alignment' error in Visual Studio 2017 (>15.8) #599
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….8, build 1915) caused by a ABI breaking fix on their end.
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See: aeron-io/aeron#599 (fixed aeron, but consumers need same define)
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c:\program files (x86)\microsoft visual studio\2017\community\vc\tools\msvc\14.15.26726\include\type_traits(1271): error C2338: You've instantiated std::aligned_storage<Len, Align> with an extended alignment (in other words, Align > alignof(max_align_t)). Before VS 2017 15.8, the member type would non-conformingly have an alignment of only alignof(max_align_t). VS 2017 15.8 was fixed to handle this correctly, but the fix inherently changes layout and breaks binary compatibility (*only* for uses of aligned_storage with extended alignments). Please define either (1) _ENABLE_EXTENDED_ALIGNED_STORAGE to acknowledge that you understand this message and that you actually want a type with an extended alignment, or (2) _DISABLE_EXTENDED_ALIGNED_STORAGE to silence this message and get the old non-conformant behavior.Fixes #567