Fixes build on arm64

Change-Id: I2116e33691e3f4e99cccc6819f7b85783069c790
diff --git a/Android.mk b/Android.mk
index cec58fd..0cb41e8 100644
--- a/Android.mk
+++ b/Android.mk
@@ -65,7 +65,7 @@
 LOCAL_CPPFLAGS := $(LIBCXXABI_CPPFLAGS)
 LOCAL_RTTI_FLAG := $(LIBCXXABI_RTTI_FLAG)
 
-ifneq ($(TARGET_ARCH),$(filter $(TARGET_ARCH),arm arm64))
+ifneq ($(TARGET_ARCH),arm)
 LOCAL_SHARED_LIBRARIES := libdl
 endif