Set correct types in wolfSSL_sk_*_new functions

- Use WOLF_SK_COMPARE_CB() to generate the correct types instead of using void* for the callback parameters.
- Remove WOLFSSL_STACK.comp entirely since it is not used anywhere. Ignore input parameters that used to set this member.

src/ssl.c

@@ -19312,7 +19312,6 @@ int wolfSSL_sk_push(WOLFSSL_STACK* sk, const void *data)
     sk->num        += 1;
 
 #ifdef OPENSSL_ALL
-    node->comp = sk->comp;
     node->hash_fn = sk->hash_fn;
     node->hash = sk->hash;
     sk->hash = 0;