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Replace errno (from assuan code) by DBusError. Errors are not passed through dbus_accept_with_nonce atm, as the original _dbus_accept() has no error arg either. Cherry-picked from commit 8082e92bb3a6304362e730f8b6e324860e1bb26c in the dbus4win repository, edited to apply and fix whitespace issues by tml@iki.fi.
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