Disable mac build for minijail_sys crate

Bug: b/149981813
Change-Id: If598b139c621a5c5279e50588b6924c4b09c688c
diff --git a/Android.bp b/Android.bp
index 687a366..aea2a03 100644
--- a/Android.bp
+++ b/Android.bp
@@ -430,4 +430,9 @@
     shared_libs: [
         "libcap",
     ],
+    target: {
+        darwin: {
+            enabled: false,
+        }
+    },
 }