added missing ether_aton and ether_ntoa

Change-Id: I32ee448abde4d5693d393030ed77ddc6d2ad1dfc
diff --git a/libc/Android.mk b/libc/Android.mk
index 8dd124e..37112cc 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -207,6 +207,8 @@
 	inet/inet_ntoa.c \
 	inet/inet_ntop.c \
 	inet/inet_pton.c \
+	inet/ether_aton.c \
+	inet/ether_ntoa.c \
 	tzcode/asctime.c \
 	tzcode/difftime.c \
 	tzcode/localtime.c \