Update libglnx
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Merge libglnx commit '07e3e49d'
- Add g_steal_fd() backport, equivalent to glnx_steal_fd()
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Use g_steal_fd() in preference to glnx_steal_fd()
Cosmetic change only, they are equivalent.
pressure-vessel/flatpak-*.c have been excluded from this change to keep them more similar to their originals in Flatpak.