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This tidies up the code a bit, and (critically) exposes a concrete structure for `ActUser` and `ActUserClass`. Previously these were dangling typedefs, which meant the compiler had no idea they derived from `GObject`, and hence would give warnings about strict aliasing when (for example) calling: ``` g_set_object (&my_user, user); ``` where `my_user` and `user` were both `ActUser*`. This shouldn’t introduce any API or ABI changes, as the library basically exposed no API in this area before. The autoptr cleanup function is now defined by `G_DECLARE_FINAL_TYPE`. libaccountsservice already depends on GLib 2.63, so no dependency bump is needed. Signed-off-by: Philip Withnall <withnall@endlessm.com>
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