Fix toolbox build issue when using TW_USE_TOOLBOX=true

Change-Id: I643873b495318d4886b9f8cfaf1b75555d3166c3
diff --git a/toolbox/Android.mk b/toolbox/Android.mk
index 4698cd2..dc4252d 100644
--- a/toolbox/Android.mk
+++ b/toolbox/Android.mk
@@ -220,10 +220,12 @@
     # which takes up more space than is necessary so long as we are still
     # including busybox.
     LOCAL_SRC_FILES += \
-        ../../../$(TWRP_TOOLBOX_PATH)/dynarray.c \
         ../../../$(TWRP_TOOLBOX_PATH)/getprop.c \
         ../../../$(TWRP_TOOLBOX_PATH)/setprop.c
     OUR_TOOLS += getprop setprop
+    ifneq ($(TW_USE_TOOLBOX), true)
+        LOCAL_SRC_FILES += ls.c
+    endif
 endif
 
 LOCAL_MODULE := toolbox_recovery