Use _FILE_OFFSET_BITS macro to distinguish between native MinGW and 32 bit under MinGW-64. The latter does not require fseeko/ftello redefinition which it already does in case of _FILE_OFFSET_BITS=64.
Use _FILE_OFFSET_BITS macro to distinguish between native MinGW and 32 bit under MinGW-64. The latter does not require fseeko/ftello redefinition which it already does in case of _FILE_OFFSET_BITS=64.