message: rocfft_ostream: make cout/cerr thread_local
  Otherwise, rocfft_cout and rocfft_cerr are unsafe to use from multiple
  threads without locking.
diff: @@ -235,14 +235,14 @@ public:
  // Implemented as singleton to avoid the static initialization order fiasco
  static rocfft_ostream& cout()
  {
  - static rocfft_ostream cout{STDOUT_FILENO};
  + thread_local rocfft_ostream cout{STDOUT_FILENO};
  return cout;
  }
  // Implemented as singleton to avoid the static initialization order fiasco
  static rocfft_ostream& cerr()
  {
  - static rocfft_ostream cerr{STDERR_FILENO};
  + thread_local rocfft_ostream cerr{STDERR_FILENO};
  return cerr;
  }
  