fix missing standard includes

These were a problem only if arch.h does not include them.

Signed-off-by: Simon Goldschmidt <goldsimon@gmx.de>

contrib/examples/example_app/test.c

@@ -34,6 +34,7 @@
 /* C runtime includes */
 #include <stdio.h>
 #include <stdarg.h>
+#include <stdlib.h>
 #include <time.h>
 #include <string.h>
 

contrib/examples/lwiperf/lwiperf_example.c

@@ -39,8 +39,8 @@ lwiperf_report(void *arg, enum lwiperf_report_type report_type,
   LWIP_UNUSED_ARG(local_addr);
   LWIP_UNUSED_ARG(local_port);
 
-  printf("IPERF report: type=%d, remote: %s:%d, total bytes: %"U32_F", duration in ms: %"U32_F", kbits/s: %"U32_F"\n",
-    (int)report_type, ipaddr_ntoa(remote_addr), (int)remote_port, bytes_transferred, ms_duration, bandwidth_kbitpsec);
+  LWIP_PLATFORM_DIAG(("IPERF report: type=%d, remote: %s:%d, total bytes: %"U32_F", duration in ms: %"U32_F", kbits/s: %"U32_F"\n",
+    (int)report_type, ipaddr_ntoa(remote_addr), (int)remote_port, bytes_transferred, ms_duration, bandwidth_kbitpsec));
 }
 
 void

contrib/examples/mqtt/mqtt_example.c

@@ -67,8 +67,8 @@ mqtt_incoming_data_cb(void *arg, const u8_t *data, u16_t len, u8_t flags)
   const struct mqtt_connect_client_info_t* client_info = (const struct mqtt_connect_client_info_t*)arg;
   LWIP_UNUSED_ARG(data);
 
-  printf("MQTT client \"%s\" data cb: len %d, flags %d\n", client_info->client_id,
-          (int)len, (int)flags);
+  LWIP_PLATFORM_DIAG(("MQTT client \"%s\" data cb: len %d, flags %d\n", client_info->client_id,
+          (int)len, (int)flags));
 }
 
 static void
@@ -76,8 +76,8 @@ mqtt_incoming_publish_cb(void *arg, const char *topic, u32_t tot_len)
 {
   const struct mqtt_connect_client_info_t* client_info = (const struct mqtt_connect_client_info_t*)arg;
 
-  printf("MQTT client \"%s\" publish cb: topic %s, len %d\n", client_info->client_id,
-          topic, (int)tot_len);
+  LWIP_PLATFORM_DIAG(("MQTT client \"%s\" publish cb: topic %s, len %d\n", client_info->client_id,
+          topic, (int)tot_len));
 }
 
 static void
@@ -85,7 +85,7 @@ mqtt_request_cb(void *arg, err_t err)
 {
   const struct mqtt_connect_client_info_t* client_info = (const struct mqtt_connect_client_info_t*)arg;
 
-  printf("MQTT client \"%s\" request cb: err %d\n", client_info->client_id, (int)err);
+  LWIP_PLATFORM_DIAG(("MQTT client \"%s\" request cb: err %d\n", client_info->client_id, (int)err));
 }
 
 static void
@@ -94,7 +94,7 @@ mqtt_connection_cb(mqtt_client_t *client, void *arg, mqtt_connection_status_t st
   const struct mqtt_connect_client_info_t* client_info = (const struct mqtt_connect_client_info_t*)arg;
   LWIP_UNUSED_ARG(client);
 
-  printf("MQTT client \"%s\" connection cb: status %d\n", client_info->client_id, (int)status);
+  LWIP_PLATFORM_DIAG(("MQTT client \"%s\" connection cb: status %d\n", client_info->client_id, (int)status));
 
   if (status == MQTT_CONNECT_ACCEPTED) {
     mqtt_sub_unsub(client,

contrib/examples/ppp/pppos_example.c

@@ -41,6 +41,8 @@
 
 #include "pppos_example.h"
 
+#include <stdio.h>
+
 #if PPPOS_SUPPORT
 static sio_fd_t ppp_sio;
 static ppp_pcb *ppp;

contrib/examples/sntp/sntp_example.c

@@ -48,7 +48,7 @@ sntp_set_system_time(u32_t sec)
 #endif
   
   strftime(buf, sizeof(buf), "%d.%m.%Y %H:%M:%S", &current_time_val);
-  printf("SNTP time: %s\n", buf);
+  LWIP_PLATFORM_DIAG(("SNTP time: %s\n", buf));
 }
 
 void

src/apps/http/altcp_proxyconnect.c

@@ -51,6 +51,8 @@
 #include "lwip/mem.h"
 #include "lwip/init.h"
 
+#include <stdio.h>
+
 /** This string is passed in the HTTP header as "User-Agent: " */
 #ifndef ALTCP_PROXYCONNECT_CLIENT_AGENT
 #define ALTCP_PROXYCONNECT_CLIENT_AGENT "lwIP/" LWIP_VERSION_STRING " (http://savannah.nongnu.org/projects/lwip)"

src/apps/http/http_client.c

@@ -55,6 +55,7 @@
 #include "lwip/init.h"
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 #if LWIP_TCP && LWIP_CALLBACK_API