[LightDM] Missing symbols in liblightdm-qt-3-0 1.26

[Yves-Alexis Perez]

Hi list, Robert,

with the release of LightDM 1.26 I started working on updating the Debian
packaging (which differs from the Ubuntu packaging) since it'll be a long-term 
branch. Previously in Debian we had 1.18, and I didn't bother packaging
shorter term branches.

The Qt library (liblightdm-qt-3-0.so) has a lot of changed symbols. Most of
them  are actually linked to a type change (LightDMGreeter ->
_LightDMGreeter):

QLightDM::GreeterPrivate::cb_authenticationComplete(LightDMGreeter*, void*)@Base
QLightDM::GreeterPrivate::cb_autoLoginExpired(LightDMGreeter*, void*)@Base
QLightDM::GreeterPrivate::cb_idle(LightDMGreeter*, void*)@Base
QLightDM::GreeterPrivate::cb_reset(LightDMGreeter*, void*)@Base
QLightDM::GreeterPrivate::cb_showMessage(LightDMGreeter*, char const*, LightDMMessageType, void*)@Base
QLightDM::GreeterPrivate::cb_showPrompt(LightDMGreeter*, char const*, LightDMPromptType, void*)@Base
QLightDM::UsersModelPrivate::cb_userAdded(LightDMUserList*, LightDMUser*, void*)@Base
QLightDM::UsersModelPrivate::cb_userChanged(LightDMUserList*, LightDMUser*, void*)@Base
QLightDM::UsersModelPrivate::cb_userRemoved(LightDMUserList*, LightDMUser*, void*)@Base

Could someone comment on this? Even if the _LightDMGreeter type is internal,
it's still exposed in exported symbols so it doesn't look really safe to
change without bumping the soname.

Some other removed symbols are:

QDBusReply<QString>::~QDBusReply()@Base
QDebug::~QDebug()@Base

Any comment on those would be welcome too.

I've attached the full diff from dpkg-gensymbols.

Regards,
-- 
Yves-Alexis
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