std::filesystem being used with c++11

[dimateos]

The following define has a an OR that ignores the c++ version check, it even ignores the __has_include check

https://github.com/cinder/Cinder/blob/4e27a4a5e66fd63000e98afa09d0d0419119ee6b/include/cinder/Filesystem.h#L27-L33

probably there is no need to check for MSVC when __cplusplus is defined