fix some compile problems with mingw

contrib/ports/win32/include/arch/cc.h

@@ -50,6 +50,11 @@
 #define LWIP_PROVIDE_ERRNO /* provide errno for non-MSVC */
 #endif /* _MSC_VER */
 
+#ifdef __GNUC__
+#define LWIP_TIMEVAL_PRIVATE 0
+#include <sys/time.h>
+#endif
+
 /* Define platform endianness (might already be defined) */
 #ifndef BYTE_ORDER
 #define BYTE_ORDER LITTLE_ENDIAN

contrib/ports/win32/pcapif_helper.c

@@ -102,7 +102,6 @@ pcapifh_alloc_readonly_copy(void *data, size_t len)
     lwip_win32_platform_diag("VirtualProtect failed: %d\n", GetLastError());
     while(1);
   }
-  printf("pcapifh_alloc_readonly_copy(%d): 0x%08x\n", len, ret);
   return ret;
 }