message: Remove thread_local storage qualifier from logbuf declaration
  This fix a bitcoin-qt crash during IBD and also the gitian build
  on linux x86_64.
diff: @@ -391,8 +391,8 @@ void LogFlush()
  int LogPrintStr(const std::string &str)
  {
  int ret = 0; // Returns total number of characters written
  - thread_local std::string logbuf;
  - string strTimestamped = LogTimestampStr(str, logbuf);
  + std::string logbuf;
  + std::string strTimestamped = LogTimestampStr(str, logbuf);
  if (!strTimestamped.size())
  return 0;
  