sparse: Fix an "symbol 'cmd_index_pack' not declared" warning

Signed-off-by: Ramsay Jones <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Ramsay Jones

builtin/index-pack.c

@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "builtin.h"
 #include "delta.h"
 #include "pack.h"
 #include "csum-file.h"