We have the _r ether_ntoa/ether_aton functions too.

We've also had them since H, not L.

Change-Id: Iee7633ea97a0ee9a00bf7b62ead315acf02a3c8e
diff --git a/libc/include/netinet/ether.h b/libc/include/netinet/ether.h
index 17b61c1..e69cdaf 100644
--- a/libc/include/netinet/ether.h
+++ b/libc/include/netinet/ether.h
@@ -34,8 +34,10 @@
 
 __BEGIN_DECLS
 
-char* ether_ntoa(const struct ether_addr*) __INTRODUCED_IN(21);
-struct ether_addr* ether_aton(const char*) __INTRODUCED_IN(21);
+char* ether_ntoa(const struct ether_addr*) __INTRODUCED_IN(11);
+char* ether_ntoa_r(const struct ether_addr*, char*) __INTRODUCED_IN(11);
+struct ether_addr* ether_aton(const char*) __INTRODUCED_IN(11);
+struct ether_addr* ether_aton_r(const char*, struct ether_addr*) __INTRODUCED_IN(11);
 
 __END_DECLS