Enable darwin target build for art.

Change-Id: I8fc04258360d663d2fcd07c307fdfdd2981cdd19
diff --git a/build/Android.gtest.mk b/build/Android.gtest.mk
index 2b677be..a59e087 100644
--- a/build/Android.gtest.mk
+++ b/build/Android.gtest.mk
@@ -163,6 +163,8 @@
 ifeq ($(ART_BUILD_TARGET),true)
   $(foreach file,$(TEST_TARGET_SRC_FILES), $(eval $(call build-art-test,target,$(file))))
 endif
-ifeq ($(ART_BUILD_HOST),true)
-  $(foreach file,$(TEST_HOST_SRC_FILES), $(eval $(call build-art-test,host,$(file))))
+ifeq ($(WITH_HOST_DALVIK),true)
+  ifeq ($(ART_BUILD_HOST),true)
+    $(foreach file,$(TEST_HOST_SRC_FILES), $(eval $(call build-art-test,host,$(file))))
+  endif
 endif