Apply version-script to libandroid library.

Hides unintentionally exported symbols from the library.

Test: make checkbuild
Bug: http://b/69603741
Change-Id: Id679077267cc5ea6168c0b4701f827458087cb70
diff --git a/native/android/Android.bp b/native/android/Android.bp
index 4fb5e74..c26d980 100644
--- a/native/android/Android.bp
+++ b/native/android/Android.bp
@@ -76,6 +76,8 @@
     export_static_lib_headers: ["libarect"],
 
     include_dirs: ["bionic/libc/dns/include"],
+
+    version_script: "libandroid.map.txt",
 }
 
 // Network library.