Further improvements to selftest, lwIP driver updates

ext/lwip/src/include/arch/cc.h

@@ -80,7 +80,8 @@ typedef unsigned long mem_ptr_t;
 #include <stdio.h>
 #include <stdlib.h>
 /* Plaform specific diagnostic output */
-#define LWIP_PLATFORM_DIAG(x)	do {printf x;} while(0)
+//#define LWIP_PLATFORM_DIAG(x)	do {printf x;} while(0)
+#define LWIP_PLATFORM_DIAG(x) printf(x);
 
 #define LWIP_PLATFORM_ASSERT(x) do {printf("Assertion \"%s\" failed at line %d in %s\n", \
                                      x, __LINE__, __FILE__); fflush(NULL); abort();} while(0)

ext/lwip/src/include/lwip/debug.h

@@ -102,7 +102,8 @@
 /** print debug message only if debug message type is enabled...
  *  AND is of correct type AND is at least LWIP_DBG_LEVEL
  */
-#define LWIP_DEBUGF(debug, message) LWIP_PLATFORM_DIAG(message);
+#include "Debug.hpp" // use libzt's more descriptive debug printers
+#define LWIP_DEBUGF(debug, message) DEBUG_LWIP message;
 
 #else  /* LWIP_DEBUG */
 #define LWIP_DEBUGF(debug, message)