[Rpm-maint] [rpm-software-management/rpm] rpmio: fix macOS compile error by moving Apple environ include to file scope (PR #4159)

[majianhan]

On macOS, `rpmio/lposix.cc` fails to compile with Clang because
`#include <crt_externs.h>` is nested inside a function body. The
header contains declarations that must appear at file scope, triggering:

```
error: expected unqualified-id
```

**Fix:** Move the `#ifdef __APPLE__ ... #include <crt_externs.h> ...
#define environ ... #else ... extern char **environ ... #endif` block
from inside `Pgetenv()` to file scope, alongside the other system
includes. The function body now simply uses `environ` directly, which
is defined at file scope for both macOS and non-Apple platforms.

Fixes #4139
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/4159

-- Commit Summary --

  * rpmio: fix macOS compile error in lposix.cc by moving include out of function

-- File Changes --

    M rpmio/lposix.cc (13)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/4159.patch
https://github.com/rpm-software-management/rpm/pull/4159.diff

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