D5853: Remove gtk+-3 build dep, install versioned gtk.css dirs unconditionally

[Marco Martin]

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

REPOSITORY
  R98 Breeze for Gtk

BRANCH
  Plasma/5.10

REVISION DETAIL
  https://phabricator.kde.org/D5853

To: asturmlechner, #plasma, mart
Cc: plasma-devel, ZrenBot, spstarr, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, lukas
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