Host multilib build of both 32-bit and 64-bit libraries.

Change-Id: I54f91f385b109fc664a1a1f9320affb2a846fef1
diff --git a/libcutils/Android.mk b/libcutils/Android.mk
index 20ad7ea..ca1fd15 100644
--- a/libcutils/Android.mk
+++ b/libcutils/Android.mk
@@ -81,6 +81,7 @@
 ifneq ($(HOST_OS),windows)
 LOCAL_CFLAGS += -Werror
 endif
+LOCAL_MULTILIB := both
 include $(BUILD_HOST_STATIC_LIBRARY)