Removed crypto_none_instance.

Rev: src/crypto.h:1.6

src/crypto.h

@@ -28,7 +28,9 @@
 
 #include "abstract_crypto.h"
 
+#if 0
 extern struct crypto_instance crypto_none_instance;
+#endif
 extern struct crypto_algorithm crypto_rc4_algorithm;
 
 extern struct hash_algorithm sha_algorithm;