[Rpm-maint] [rpm-software-management/rpm] luaext/Pexec: optimize setting CLOEXEC (#444)

[Kirill Kolyshkin]

```
kir at kd:~/git/rpm$ time ./a 64 1000000 p

real	0m3.413s
user	0m0.416s
sys	0m2.994s
kir at kd:~/git/rpm$ time ./a 64 1000000 i

real	0m3.661s
user	0m1.421s
sys	0m2.233s
```

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