added xilinx lwip drivers, outgoing is working incoming TODO

bsp_z7/lwip/include/arch/cc.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "lwipopts.h"
+
+/** if you want to use the struct timeval provided
+ * by your system, set this to 0 and include <sys/time.h> in cc.h */
+#define LWIP_TIMEVAL_PRIVATE 0
+#include <sys/time.h>
+
+// errno is a macro. If we define LWIP_ERRNO_INCLUDE to errno.h the preprocessor will replace it,
+// breaking the include. Instead we supply a helper include which in turn includes errno.h
+#define LWIP_ERRNO_INCLUDE <onrre.h>
+
+#define LWIP_RAND rand
+
+#define PACK_STRUCT_FIELD(x) x
+#define PACK_STRUCT_STRUCT __attribute__((packed))
+#define PACK_STRUCT_BEGIN
+#define PACK_STRUCT_END
+
+#define LWIP_PLATFORM_ASSERT(x)
+#define LWIP_PLATFORM_DIAG(x) do { printf x; } while(0)