D7304: Do not leak symbols of pimpl classes, protect with Q_DECL_HIDDEN

[David Faure]

dfaure accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R127 KWayland

BRANCH
  davidedmundson/xdgv6

REVISION DETAIL
  https://phabricator.kde.org/D7304

To: davidedmundson, #plasma, dfaure
Cc: plasma-devel, #frameworks, leezu, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, eliasp, sebas, apol, mart, hein, lukas
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