vendor/debian/makefile: apply 6f3c4e33 for debian/makefile as well

vendor/debian/makefile

@@ -5,7 +5,7 @@ SUBDIR=vendor/debian
 # Bring in the default rules
 include ../../buildlib/defaults.mak
 
-doc: sources.list
+doc binary: sources.list
 
 sources.list: sources.list.in ../../doc/apt-verbatim.ent
 	sed -e 's#&stable-codename;#$(shell ../getinfo debian-stable-codename)#g' $< > $@