message: Fix false-positive uninitialised warning on VS2017
diff: @@ -964,7 +964,7 @@ ExecuteResult Process::InjectIntoProcess(uint32_t pid, const rdcarray<Environmen
  uint32_t Process::LaunchProcess(const char *app, const char *workingDir, const char *cmdLine,
  bool internal, ProcessResult *result)
  {
  - HANDLE hChildStdOutput_Rd, hChildStdError_Rd;
  + HANDLE hChildStdOutput_Rd = NULL, hChildStdError_Rd = NULL;
  PROCESS_INFORMATION pi =
  RunProcess(app, workingDir, cmdLine, {}, internal, result ? &hChildStdOutput_Rd : NULL,
  