Merge "installd: Wait indefinitely for the subprocess if pidfd_open fails."

int wait_child_with_timeout(pid_t pid, int timeout_ms) {

    int pidfd = pidfd_open(pid, /*flags=*/0);

    if (pidfd < 0) {

        PLOG(ERROR) << "pidfd_open failed for pid " << pid;

        kill(pid, SIGKILL);

        PLOG(ERROR) << "pidfd_open failed for pid " << pid

                    << ", waiting for child process without timeout";

        return wait_child(pid);

    }