added workaround for wrong value of __cplusplus in MSVC compiler #136
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The Microsoft Visual C++ compiler dies not define __cplucpluc correctly unless /Zc:__cplusplus is specified. As a result, the TL_EXPECTED_CXX14 macro is not defined on Visual C++ compiler, even if they support C++14. I added a chevck for the Visual C++ compiler version to correctly set TL_EXPECTED_CXX14 for Visual Sudio 2017+.