Fix support-files/build-tags for newer bzr which do not default to --recursive on bzr ls.

support-files/build-tags

@@ -4,7 +4,7 @@ rm -f TAGS
 filter='\.cc$\|\.c$\|\.h$\|\.yy$'
 
 list="find . -type f"
-bzr root >/dev/null 2>/dev/null && list="bzr ls --kind=file --versioned"
+bzr root >/dev/null 2>/dev/null && list="bzr ls --recursive --kind=file --versioned"
 
 $list |grep $filter |while read f; 
 do