Introducing linker namespaces

Bug: http://b/22548808
Change-Id: Ia3af3c0a167f1d16447a3d83bb045d143319b1e1
diff --git a/libdl/libdl.map.txt b/libdl/libdl.map.txt
index f71f40b..421d825 100644
--- a/libdl/libdl.map.txt
+++ b/libdl/libdl.map.txt
@@ -28,10 +28,16 @@
     *;
 };
 
+LIBC_N {
+  global:
+    android_init_public_namespace;
+    android_create_namespace;
+} LIBC;
+
 LIBC_PRIVATE {
   global:
     android_get_application_target_sdk_version;
     android_set_application_target_sdk_version;
     android_get_LD_LIBRARY_PATH;
     android_update_LD_LIBRARY_PATH;
-} LIBC;
+} LIBC_N;