treewide: replace cache.h with more direct headers, where possible

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/hook.c b/hook.c
index 1a84831..f6ddd79 100644
--- a/hook.c
+++ b/hook.c
@@ -1,7 +1,10 @@
-#include "cache.h"
+#include "git-compat-util.h"
+#include "advice.h"
+#include "gettext.h"
 #include "hook.h"
 #include "run-command.h"
 #include "config.h"
+#include "strbuf.h"
 
 const char *find_hook(const char *name)
 {