Fix darwin build break.

Bug: http://b/143994895
Test: mma on linux
Change-Id: Ia361959461262ff6d5e299d6815a6b1772590d90
diff --git a/libs/adbd_auth/Android.bp b/libs/adbd_auth/Android.bp
index f68ab5e..9cf0143 100644
--- a/libs/adbd_auth/Android.bp
+++ b/libs/adbd_auth/Android.bp
@@ -30,6 +30,11 @@
 
     host_supported: true,
     recovery_available: true,
+    target: {
+        darwin: {
+            enabled: false,
+        }
+    },
 
     shared_libs: [
         "libbase",