Fix FileStat stat parsing on non-GNU systems #20830
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SilentSobs
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This PR fixes a portability issue in Msf::Post::File.stat where the implementation assumed GNU stat --format output.
On non-GNU systems (such as BSD variants), the existing code raised a runtime exception because the stat output did not match the expected format. This change preserves existing GNU/Linux behavior and adds a minimal, behavior-based fallback to a BSD-compatible stat -f format when the initial output does not match expectations.
No OS detection is introduced, and no external interfaces are changed.
Fixes #20030