treewide: remove cache.h inclusion due to previous changes

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/date.c b/date.c
index bc030da..a6ca6b3 100644
--- a/date.c
+++ b/date.c
@@ -4,7 +4,7 @@
  * Copyright (C) Linus Torvalds, 2005
  */
 
-#include "cache.h"
+#include "git-compat-util.h"
 #include "date.h"
 #include "gettext.h"
 #include "pager.h"