libcrypto: Use a pointer for EVP_CIPHER_CTX

This has been made opaque and it needs to be a pointer.

This is for OpenSSL 1.1.0 support.

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

src/wrapper.c

@@ -123,6 +123,9 @@ void ssh_cipher_clear(struct ssh_cipher_struct *cipher){
   if (cipher->cleanup != NULL){
     cipher->cleanup(cipher);
   }
+#ifdef HAVE_LIBCRYPTO
+  EVP_CIPHER_CTX_free(cipher->ctx);
+#endif
 }
 
 static void cipher_free(struct ssh_cipher_struct *cipher) {