remove spurious declaration of __getdents from readdir.c

src/dirent/readdir.c

@@ -8,8 +8,6 @@
 typedef char dirstream_buf_alignment_check[1-2*(int)(
 	offsetof(struct __dirstream, buf) % sizeof(off_t))];
 
-int __getdents(int, struct dirent *, size_t);
-
 struct dirent *readdir(DIR *dir)
 {
 	struct dirent *de;