Fix wrong argument size passed to --parent-pid strncmp check

This PR fixes wrong size argument passed in `strncmp(arg, "--parent-pid", 10)` as the `"--parent-pid"` string has length of 12. Closes #1502

Author: disconnect3d

mysql-test/lib/My/SafeProcess/safe_process_win.cc

@@ -206,7 +206,7 @@ int main(int argc, const char** argv )
  } else {
  if (strcmp(arg, "--verbose") == 0)
  verbose++;
- else if (strncmp(arg, "--parent-pid", 10) == 0)
+ else if (strncmp(arg, "--parent-pid", 12) == 0)
  {
  /* Override parent_pid with a value provided by user */
  const char* start;