Fix implicit declaration of function 'prctl' in logd.

#include <stdlib.h>

#include <string.h>

#include <sys/capability.h>

#include <sys/prctl.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <unistd.h>

#include <linux/prctl.h>

#include <cutils/properties.h>

#include "private/android_filesystem_config.h"