parameters to script are not passed to workers.

gistfile1.txt

I added debug prints.
```
static int pmain(lua_State *L) {
  uv_loop_t *loop;
  /*uv_timer_t gc_timer;*/
  struct Smain *s = (struct Smain *)lua_touserdata(L, 1);
  char **argv = s->argv;
  int script;
  int flags = 0;
  globalL = L;
for (int i = 1; argv[i] != NULL; i++) {
printf("pmain worker_id=%s arg[%d]=%s\n", getenv("LEV_WORKER_ID"), i, argv[i]);
}
  if (argv[0] && argv[0][0]) progname = argv[0];
```

The output was:
```
pmain worker_id=(null) arg[1]=tools/checkit
pmain worker_id=(null) arg[2]=tests/test-fs-stat.lua
pmain worker_id=1 arg[1]=tools/checkit
```