ccrypt: disable format hardening

pkgs/tools/security/ccrypt/default.nix

···
 
   nativeBuildInputs = [ perl ];
 
+  hardeningDisable = [ "format" ];
+
   meta = {
     homepage = http://ccrypt.sourceforge.net/;
     description = "Utility for encrypting and decrypting files and streams with AES-256";