Moved private dns header to their own dir.

Bug: 13219633
Change-Id: I3435ef7564b9ad3c7b54188a0809440993b36c9e
diff --git a/libc/Android.mk b/libc/Android.mk
index f3a2ce8..42e9fae 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -513,6 +513,7 @@
 LOCAL_CFLAGS := \
     $(libc_common_cflags) \
     -DINET6 \
+    -I$(LOCAL_PATH)/dns/include \
     -I$(LOCAL_PATH)/private \
     -I$(LOCAL_PATH)/upstream-netbsd/lib/libc/include # for NetBSD private headers
 LOCAL_CONLYFLAGS := $(libc_common_conlyflags)