BC breakage: MessageFactory removed

[David Faure]

commit 242fb36
Author: Montel Laurent <montel at kde.org>
Date:   Fri Feb 10 13:51:28 2017 +0100

    Remove old class

[...]
-class MESSAGECOMPOSER_EXPORT MessageFactory
[...]

It is (obviously) BIC+SIC to remove an exported class that was defined in a 
public header.

Is libKF5MessageList.so considered released and stable and usable by
third-party programs?

In that case, either messagefactoryng can be done within the MessageFactory 
API, or you need to keep MessageFactory around and deprecate it.

-- 
David Faure, faure at kde.org, http://www.davidfaure.fr
Working on KDE Frameworks 5