copy.h: move declarations for copy.c functions from cache.h

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/bundle-uri.c b/bundle-uri.c
index 1ff1cf5..6d44662 100644
--- a/bundle-uri.c
+++ b/bundle-uri.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "bundle-uri.h"
 #include "bundle.h"
+#include "copy.h"
 #include "environment.h"
 #include "gettext.h"
 #include "object-store.h"