message: Fix including of <cstddef>
  <cstddef> introduces C macros but, by itself, it's still a C++ header.
diff: #define DLL_PUBLIC __attribute__((visibility("default")))
  #endif
  +#include <cstddef>
  +
  #ifdef __cplusplus
  extern "C" {
  #endif
  -#include <cstddef>
  -
  typedef enum hipfftResult_t
  {
  HIPFFT_SUCCESS = 0, // The hipFFT operation was successful
  