walker: drop fields of struct walker which are always 1

After the previous commit, both users of `struct walker` set `get_tree`,
`get_history` and `get_all` to 1. Drop those fields and simplify the
walker implementation accordingly.

Let's hope that any out-of-tree users will not mind this change. They
should notice that the compilation fails as they try to set these
fields. (If they do not set them, note that `get_http_walker()` leaves
them undefined, so the behavior will have been undefined all the time.)

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

walker.h

@@ -9,9 +9,6 @@ struct walker {
 	void (*prefetch)(struct walker *, unsigned char *sha1);
 	int (*fetch)(struct walker *, unsigned char *sha1);
 	void (*cleanup)(struct walker *);
-	int get_tree;
-	int get_history;
-	int get_all;
 	int get_verbosely;
 	int get_recover;