Merge pull request #8967 from kaspar030/fix_missing_uhcpc_include

sys/net/uhcpc: add missing stdio.h include

sys/net/application_layer/uhcp/uhcpc.c

@@ -7,6 +7,7 @@
  */
 
 #include <arpa/inet.h>
+#include <stdio.h>
 
 #include "net/af.h"
 #include "net/sock/udp.h"