[Rpm-maint] [rpm] Add lua function posix.close (#44)

[Zbigniew Jędrzejewski-Szmek]

This is useful to silence output in forked programs:
https://bugzilla.redhat.com/show_bug.cgi?id=1287918

Tested with the following scriptlet:
```
%post -p <lua>
pid = posix.fork()
if pid == 0 then
    assert(posix.exec("/bin/sed"))
elseif pid > 0 then
    posix.wait(pid)
end
pid = posix.fork()
if pid == 0 then
    posix.close(2)
    io.open("/dev/null")
    assert(posix.exec("/bin/awk"))
elseif pid > 0 then
    posix.wait(pid)
end
```

As expected, the error message from sed is printed, the error message
from awk is not.

You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/44

-- Commit Summary --

  * Add posix.close

-- File Changes --

    M luaext/lposix.c (8)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/44.patch
https://github.com/rpm-software-management/rpm/pull/44.diff

---
Reply to this email directly or view it on GitHub:
https://github.com/rpm-software-management/rpm/pull/44
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