Fix libdl inclusion for default-ub.

We shouldn't be using ldlibs for target libraries because it doesn't
add a real dependency.

Change-Id: Ib1ec40b95356feb521e95674b64d04d5ecc06332

core/config_sanitizers.mk

@@ -52,12 +52,13 @@ endif
 
 ifneq ($(filter default-ub,$(my_sanitize)),)
   my_sanitize := $(CLANG_DEFAULT_UB_CHECKS)
-  my_ldlibs += -ldl
 
   ifdef LOCAL_IS_HOST_MODULE
     my_cflags += -fno-sanitize-recover=all
+    my_ldlibs += -ldl
   else
     my_cflags += -fsanitize-undefined-trap-on-error
+    my_shared_libraries += libdl
   endif
 endif