logd: Add SCHED_BATCH to reduce priority

#include <dirent.h>

#include <errno.h>

#include <fcntl.h>

#include <sched.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "LogListener.h"

static int drop_privs() {

    struct sched_param param;

    memset(&param, 0, sizeof(param));

    if (sched_setscheduler((pid_t) 0, SCHED_BATCH, &param) < 0) {

        return -1;

    }

    if (prctl(PR_SET_KEEPCAPS, 1) < 0) {

        return -1;

    }