message: msvc compatible ssize_t
diff: #include <hdlConvertor/conversion_exception.h>
  #include <hdlConvertor/verilogPreproc/a_macro_def.h>
  +#if defined(_MSC_VER)
  +#include <BaseTsd.h>
  +typedef SSIZE_T ssize_t;
  +#endif
  +
  namespace hdlConvertor {
  namespace verilog_pp {
  