[kstyle] Drop Qt 4 style plugin
Summary: KWindowSystem cannot be used in the Qt 4 style plugin. On the other hand, we need to use KWindowSystem to make QWidget-based internal clients in KWin cast drop-shadows. Another problem with the Qt 4 style plugin is that some distributions have already dropped Qt 4, so one has to build it first in order to verify that his or her change works with Qt 4. Given maintenance burden and the fact that Qt 6 is around the corner, this change drops the Qt 4 style plugin. Reviewers: #kwin, #plasma, davidedmundson Reviewed By: #kwin, #plasma, davidedmundson Subscribers: davidedmundson, mart, plasma-devel Tags: #plasma Maniphest Tasks: T12496 Differential Revision: https://phabricator.kde.org/D26476
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5a447b59
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