make tcp apps depend on LWIP_CALLBACK_API, too

src/apps/httpd/httpd.c

@@ -102,7 +102,7 @@
 #include <stdlib.h> /* atoi */
 #include <stdio.h>
 
-#if LWIP_TCP
+#if LWIP_TCP && LWIP_CALLBACK_API
 
 /** Minimum length for a valid HTTP/0.9 request: "GET /\r\n" -> 7 bytes */
 #define MIN_REQ_LEN   7
@@ -2619,4 +2619,4 @@ http_set_cgi_handlers(const tCGI *cgis, int num_handlers)
 }
 #endif /* LWIP_HTTPD_CGI */
 
-#endif /* LWIP_TCP */
+#endif /* LWIP_TCP && LWIP_CALLBACK_API */

src/apps/lwiperf/lwiperf.c

@@ -53,7 +53,7 @@
 #include <string.h>
 
 /* Currently, only TCP-over-IPv4 is implemented (does iperf support IPv6 anyway?) */
-#if LWIP_IPV4 && LWIP_TCP
+#if LWIP_IPV4 && LWIP_TCP && LWIP_CALLBACK_API
 
 /** Specify the idle timeout (in seconds) after that the test fails */
 #ifndef LWIPERF_TCP_MAX_IDLE_SEC
@@ -658,4 +658,4 @@ lwiperf_abort(void* lwiperf_session)
   }
 }
 
-#endif /* LWIP_IPV4 && LWIP_TCP */
+#endif /* LWIP_IPV4 && LWIP_TCP && LWIP_CALLBACK_API */

src/apps/mqtt/mqtt.c

@@ -47,14 +47,16 @@
  * Erik Andersson <erian747@gmail.com>
  *
  */
-#include <string.h>
+#include "lwip/apps/mqtt.h"
 #include "lwip/timeouts.h"
 #include "lwip/ip_addr.h"
 #include "lwip/mem.h"
 #include "lwip/err.h"
 #include "lwip/pbuf.h"
 #include "lwip/tcp.h"
-#include "lwip/apps/mqtt.h"
+#include <string.h>
+
+#if LWIP_TCP && LWIP_CALLBACK_API
 
 /**
  * MQTT_DEBUG: Default is off.
@@ -1335,3 +1337,5 @@ mqtt_client_is_connected(mqtt_client_t *client)
   LWIP_ASSERT("mqtt_client_is_connected: client != NULL", client);
   return client->conn_state == MQTT_CONNECTED;
 }
+
+#endif /* LWIP_TCP && LWIP_CALLBACK_API */

src/include/lwip/apps/mqtt.h

@@ -39,6 +39,7 @@
 
 #include "lwip/apps/mqtt_opts.h"
 #include "lwip/err.h"
+#include "lwip/ip_addr.h"
 
 #ifdef __cplusplus
 extern "C" {