Fix implicit declaration of function 'prctl' in adb.

#include <cutils/properties.h>

#include <private/android_filesystem_config.h>

#include <sys/capability.h>

#include <linux/prctl.h>

#include <sys/mount.h>

#include <sys/prctl.h>

#include <getopt.h>

#include <selinux/selinux.h>

#else