Prevent dependency cycle on linux_bionic due to system_shared_libs expansion.

Test: Rely on ART (linux-bionic build target) postsubmit testing.
Bug: 31559095
Change-Id: Ie911abd8ca173b231c03730c326de7777b97452c
diff --git a/Android.bp b/Android.bp
index b0ae367..e2a2902 100644
--- a/Android.bp
+++ b/Android.bp
@@ -160,6 +160,9 @@
             },
             system_shared_libs: [],
         },
+        linux_bionic: {
+            system_shared_libs: [],
+        },
     },
 }