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remove compiler warnings

#include <unistd.h>
#include <errno.h>

#include <pthread.h>
#include "thread_internal.h"

int pthread_attr_setscope(pthread_attr_t*attr,int scope) {
  (void)attr;
  if (scope==PTHREAD_SCOPE_SYSTEM) return 0;
  if (scope==PTHREAD_SCOPE_PROCESS) return ENOTSUP;
  return EINVAL;
}