Explicitly disable the Mac build.

Bug: N/A
Test: N/A
Change-Id: Ib188cf9ada5b4e801d6f1c7e58a9a474f96a16f0
diff --git a/tests/headers/posix/Android.bp b/tests/headers/posix/Android.bp
index 624d981..682627f 100644
--- a/tests/headers/posix/Android.bp
+++ b/tests/headers/posix/Android.bp
@@ -25,4 +25,9 @@
       "-D_XOPEN_SOURCE=700",
     ],
     host_supported: true,
+    target: {
+        darwin: {
+            enabled: false,
+        },
+    },
 }