dnsdist: Fix several issues

Add patch that detects when -latomic is needed.

Fix compilation without deprecated OpenSSL APIs.

Hard-code lua to avoid luajit dependency.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

net/dnsdist/patches/300-openssl-deprecated.patch

@@ -0,0 +1,29 @@
+--- a/tcpiohandler.cc
++++ b/tcpiohandler.cc
+@@ -369,8 +369,10 @@ public:
+     }
+ 
+     if (s_users.fetch_add(1) == 0) {
++#if OPENSSL_VERSION_NUMBER < 0x10100000L
+       ERR_load_crypto_strings();
+       OpenSSL_add_ssl_algorithms();
++#endif
+       openssl_thread_setup();
+ 
+       s_ticketsKeyIndex = SSL_CTX_get_ex_new_index(0, nullptr, nullptr, nullptr, nullptr);
+@@ -439,6 +441,7 @@ public:
+     d_tlsCtx.reset();
+ 
+     if (s_users.fetch_sub(1) == 1) {
++#if OPENSSL_VERSION_NUMBER < 0x10100000L
+       ERR_free_strings();
+ 
+       EVP_cleanup();
+@@ -448,6 +451,7 @@ public:
+       CONF_modules_unload(1);
+ 
+       CRYPTO_cleanup_all_ex_data();
++#endif
+       openssl_thread_cleanup();
+     }
+   }