Fix warnings for nanox sdk

src_common/ethUstream.c

@@ -16,6 +16,7 @@
  ********************************************************************************/
 
 #include <stdint.h>
+#include <string.h>
 
 #include "ethUstream.h"
 #include "ethUtils.h"

src_common/uint256.c

@@ -18,7 +18,7 @@
 // Adapted from https://github.com/calccrypto/uint256_t
 
 #include <stdio.h>
-#include <stdlib.h>
+#include <string.h>
 
 #include "uint256.h"