git: update to v2.5.0

Update to git version v2.5.0.

* Upstream commit 5455ee0573a22bb793a7083d593ae1ace909cd4c (Merge branch
  'bc/object-id') changed API:

  for_each_ref() callback functions were taught to name the objects
  not with "unsigned char sha1[20]" but with "struct object_id".

* Upstream commit dcf692625ac569fefbe52269061230f4fde10e47 (path.c: make
  get_pathname() call sites return const char *)

Signed-off-by: Christian Hesse <mail@eworm.de>

cgit.h

@@ -335,7 +335,7 @@ extern void strbuf_ensure_end(struct strbuf *sb, char c);
 
 extern void cgit_add_ref(struct reflist *list, struct refinfo *ref);
 extern void cgit_free_reflist_inner(struct reflist *list);
-extern int cgit_refs_cb(const char *refname, const unsigned char *sha1,
+extern int cgit_refs_cb(const char *refname, const struct object_id *oid,
 			int flags, void *cb_data);
 
 extern void *cgit_free_commitinfo(struct commitinfo *info);