object-store: move function declarations to their respective subsystems

We carry declarations for a couple of functions in "object-store.h" that
are not defined in "object-store.c", but in a different subsystem. Move
these declarations to the respective headers whose matching code files
carry the corresponding definition.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

packfile.h

@@ -3,6 +3,7 @@
 
 #include "list.h"
 #include "object.h"
+#include "object-store.h"
 #include "oidset.h"
 
 /* in object-store.h */
@@ -117,6 +118,24 @@ void for_each_file_in_pack_dir(const char *objdir,
 			       each_file_in_pack_dir_fn fn,
 			       void *data);
 
+/*
+ * Iterate over all accessible packed objects without respect to reachability.
+ * By default, this includes both local and alternate packs.
+ *
+ * Note that some objects may appear twice if they are found in multiple packs.
+ * Each pack is visited in an unspecified order. By default, objects within a
+ * pack are visited in pack-idx order (i.e., sorted by oid).
+ */
+typedef int each_packed_object_fn(const struct object_id *oid,
+				  struct packed_git *pack,
+				  uint32_t pos,
+				  void *data);
+int for_each_object_in_pack(struct packed_git *p,
+			    each_packed_object_fn, void *data,
+			    enum for_each_object_flags flags);
+int for_each_packed_object(struct repository *repo, each_packed_object_fn cb,
+			   void *data, enum for_each_object_flags flags);
+
 /* A hook to report invalid files in pack directory */
 #define PACKDIR_FILE_PACK 1
 #define PACKDIR_FILE_IDX 2