Merge branch 'jc/cache-tree' into next

* jc/cache-tree:
  commit-tree: allow generic object name for the tree as well.
  Makefile: remove and create xdiff library from scratch.
  t0000-basic: Add ls-tree recursive test back.

diff --cc Makefile
Simple merge

diff --cc update-index.c
index 157488f,258a88c..4c6bcfa
--- 1/update-index.c
--- 2/update-index.c
+++ b/update-index.c
@@@ -6,8 -6,8 +6,9 @@@
  #include "cache.h"
  #include "strbuf.h"
  #include "quote.h"
+ #include "cache-tree.h"
  #include "tree-walk.h"
 +#include "cache-tree.h"
  
  /*
   * Default to not allowing changes to the list of files. The