crypto: add compat cast5_set_key with nettle < 3.0.0

Prior to the nettle 3.0.0 release, the cast5_set_key function
was actually named cast128_set_key, so we must add a compatibility
definition.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

crypto/cipher-nettle.c

@@ -34,6 +34,8 @@ typedef nettle_crypt_func nettle_cipher_func;
 
 typedef void *       cipher_ctx_t;
 typedef unsigned     cipher_length_t;
+
+#define cast5_set_key cast128_set_key
 #else
 typedef const void * cipher_ctx_t;
 typedef size_t       cipher_length_t;