Apply changes after migration to upstream.

Change-Id: I238ddc9d9461402d15509bdacba7fee22ebf900b
diff --git a/Android.mk b/Android.mk
index 6210620..c59e55c 100644
--- a/Android.mk
+++ b/Android.mk
@@ -8,6 +8,7 @@
 
 # MCLinker Libraries
 subdirs := \
+  lib/ADT \
   lib/CodeGen \
   lib/LD \
   lib/MC \