add missing flag
add missing flag

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@8203 3c298f89-4303-0410-b956-a3cf2f4a3e73

--- a/include/subdir.mk
+++ b/include/subdir.mk
@@ -5,7 +5,7 @@
 # l: show legacy targets
 
 ifeq ($(DEBUG),all)
-  build_debug:=dt
+  build_debug:=dlt
 else
   build_debug:=$(DEBUG)
 endif

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