Bug 1497937 - fixed a deprecation warning due to including an older header; r=rstrong

Differential Revision: https://phabricator.services.mozilla.com/D8561

--HG--
extra : moz-landing-system : lando

modules/libmar/sign/nss_secutil.h

@@ -13,7 +13,7 @@
 #include "cryptohi.h"
 #include "hasht.h"
 #include "cert.h"
-#include "key.h"
+#include "keyhi.h"
 #include <stdint.h>
 
 typedef struct {