Make DNS request for plat prefix detection network specific.

When plat prefix detection is done on a non-default network it
must use the network specific version of getaddrinfo() so the
plat prefix corresponds to the particular network.  The network
is specified to clatd via a NetID command line argument.

Change-Id: I77a47b24e68c7786f790974f05787a40a4934af5
diff --git a/Android.mk b/Android.mk
index 72fc0f9..f94acdf 100644
--- a/Android.mk
+++ b/Android.mk
@@ -4,7 +4,7 @@
 LOCAL_SRC_FILES:=clatd.c dump.c checksum.c translate.c icmp.c ipv4.c ipv6.c config.c dns64.c logging.c getaddr.c getroute.c netlink_callbacks.c netlink_msg.c setif.c setroute.c mtu.c
 
 LOCAL_CFLAGS := -Wall -Werror -Wunused-parameter
-LOCAL_C_INCLUDES := external/libnl/include
+LOCAL_C_INCLUDES := external/libnl/include bionic/libc/dns/include
 LOCAL_STATIC_LIBRARIES := libnl
 LOCAL_SHARED_LIBRARIES := libcutils liblog