Add void to function parameters. This is for compatibility with C++

src/load.c

@@ -55,7 +55,7 @@ irep_free(size_t sirep, mrb_state *mrb)
 }
 
 static size_t
-offset_crc_body()
+offset_crc_body(void)
 {
   struct rite_binary_header header;
   return ((uint8_t *)header.binary_crc - (uint8_t *)&header) + sizeof(header.binary_crc);

src/pool.c

@@ -171,7 +171,7 @@ mrb_pool_realloc(mrb_pool *pool, void *p, size_t oldlen, size_t newlen)
 
 #ifdef TEST_POOL
 int
-main()
+main(void)
 {
   int i, len = 250;
   mrb_pool *pool;