fix: resolve warnings during build (#1532)

Author: mikomikotaishi

src/dpp/sslconnection.cpp

@@ -277,7 +277,6 @@ void ssl_connection::on_buffer_drained() {
 /* SSL Client constructor throws std::runtime_error if it can't allocate a socket or call connect() */
 void ssl_connection::connect() {
 	/* Resolve hostname to IP */
-	int err = 0;
 	const dns_cache_entry* addr = resolve_hostname(hostname, port);
 	sfd = addr->make_connecting_socket();
 	address_t destination = addr->get_connecting_address(from_string<uint16_t>(this->port, std::dec));

src/dpp/utility.cpp

@@ -465,7 +465,7 @@ void exec(const std::string& cmd, std::vector<std::string> parameters, cmd_resul
 			}
 			/* Capture stderr */
 			cmd_and_parameters << " 2>&1";
-			std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd_and_parameters.str().c_str(), "r"), pclose);
+			std::unique_ptr<FILE, int(*)(FILE*)> pipe(popen(cmd_and_parameters.str().c_str(), "r"), pclose);
 			if (!pipe) {
 				return;
 			}