implement missing seekdir and telldir

Bug: 18266863
Change-Id: I189ee949d4f7ccee099f3341e349cd969d25480f
diff --git a/libc/include/dirent.h b/libc/include/dirent.h
index a849a61..820558a 100644
--- a/libc/include/dirent.h
+++ b/libc/include/dirent.h
@@ -70,6 +70,8 @@
 extern int readdir64_r(DIR*, struct dirent64*, struct dirent64**);
 extern int closedir(DIR*);
 extern void rewinddir(DIR*);
+extern void seekdir(DIR*, long);
+extern long telldir(DIR*);
 extern int dirfd(DIR*);
 extern int alphasort(const struct dirent**, const struct dirent**);
 extern int alphasort64(const struct dirent64**, const struct dirent64**);