Make libarect_headers available for libRSSupport

Bug: http://b/153609531

Test: m libnative_bridge_guest_libRSSupport.native_bridge

Change-Id: I864ad01c5496c51f562eb4ed25d0225221c91064
diff --git a/libs/arect/Android.bp b/libs/arect/Android.bp
index 258a4e3..80aa891 100644
--- a/libs/arect/Android.bp
+++ b/libs/arect/Android.bp
@@ -22,6 +22,8 @@
 
 cc_library_headers {
     name: "libarect_headers",
+    // TODO(b/153609531): remove when no longer needed.
+    native_bridge_supported: true,
     export_include_dirs: ["include"],
 }