name-hash.h: move declarations for name-hash.c from cache.h

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/apply.c b/apply.c
index 6212ab3..3da33bb 100644
--- a/apply.c
+++ b/apply.c
@@ -23,6 +23,7 @@
 #include "xdiff-interface.h"
 #include "ll-merge.h"
 #include "lockfile.h"
+#include "name-hash.h"
 #include "object-name.h"
 #include "object-file.h"
 #include "parse-options.h"