Update libglnx subproject to 2026-09-18

libglnx v2017.2-255-g2ed30d8

* chase: Pass NO_AUTOMOUNT to chase_open_tree in shortcut path
* chase: Fix incorrect comment
* build: Suppress `-Wmissing-field-initializers`
* fdio: Don't change ownership of symlinks if not requested
  (Resolves: https://github.com/flatpak/flatpak-builder/issues/770)
* fdio: Don't try to use fd-relative operations to set symlink xattrs
  (Resolves: https://github.com/flatpak/flatpak/issues/6818)

Signed-off-by: Simon McVittie <smcv@collabora.com>
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