Add missing libdl so that bcc builds with gold.

Change-Id: I75b8bec6b5714e4d910d231886bfe7d1d9e9bfc3
diff --git a/tests/Android.mk b/tests/Android.mk
index 5463979..33f935d 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -30,7 +30,7 @@
     disassem.cpp
 
 LOCAL_SHARED_LIBRARIES := \
-    libbcc
+    libbcc libdl
 
 LOCAL_C_INCLUDES :=	\
 	$(LOCAL_PATH)/../include