Enable host multilib for ART testing.

Change-Id: Ic3ae5122eba13565fb5a4cb1bd0e7e465fb2140c
diff --git a/libziparchive/Android.mk b/libziparchive/Android.mk
index 1d48fea..705caa5 100644
--- a/libziparchive/Android.mk
+++ b/libziparchive/Android.mk
@@ -42,6 +42,7 @@
 LOCAL_STATIC_LIBRARIES := libz libutils
 LOCAL_MODULE:= libziparchive-host
 LOCAL_CFLAGS := -Werror
+LOCAL_MULTILIB := both
 include $(BUILD_HOST_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)