Disable darwin build of art

Change-Id: I763a104078325ff4b59714a05f1b4762baaf5611
diff --git a/Android.mk b/Android.mk
index 27cce22..feddd98 100644
--- a/Android.mk
+++ b/Android.mk
@@ -99,6 +99,10 @@
 	adb shell rm system/app/*.oat
 	adb shell rm data/run-test/test-*/art-cache/*.oat
 
+ifeq ($(HOST_OS)-$(HOST_ARCH),darwin-x86)
+art_dont_bother := true
+endif
+
 ifneq ($(art_dont_bother),true)
 
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