write-or-die.h: move declarations for write-or-die.c functions from cache.h

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

http-backend.c

@@ -18,6 +18,7 @@
 #include "protocol.h"
 #include "date.h"
 #include "wrapper.h"
+#include "write-or-die.h"
 
 static const char content_type[] = "Content-Type";
 static const char content_length[] = "Content-Length";