Modularize commit-walker

This turns the extern functions to be provided by the backend into a
struct of pointers, renames the functions to be more
namespace-friendly, and updates http-fetch to this interface. It
removes the unused include from http-push.c. It makes git-http-fetch a
builtin (with the implementation a separate file, accessible
directly).

Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

http-push.c

@@ -1,7 +1,6 @@
 #include "cache.h"
 #include "commit.h"
 #include "pack.h"
-#include "fetch.h"
 #include "tag.h"
 #include "blob.h"
 #include "http.h"