Reverse my previous revert, and eliminate the attempted installation of the...

Reverse my previous revert, and eliminate the attempted installation of the other Gtk 3 theme versions

Breeze-dark-gtk/CMakeLists.txt

@@ -3,8 +3,4 @@ install(DIRECTORY gtk-2.0 DESTINATION ${KDE_INSTALL_FULL_DATAROOTDIR}/themes/Bre
 install(DIRECTORY assets DESTINATION ${KDE_INSTALL_FULL_DATAROOTDIR}/themes/Breeze-Dark
         ${directory_EXCLUDES})
 
-if (PKG_GTK_VERSION VERSION_LESS "3.20")
-install(FILES gtk-3.18/gtk.css DESTINATION ${KDE_INSTALL_FULL_DATAROOTDIR}/themes/Breeze-Dark/gtk-3.0/)
-else()
-install(FILES gtk-3.20/gtk.css DESTINATION ${KDE_INSTALL_FULL_DATAROOTDIR}/themes/Breeze-Dark/gtk-3.0/)
-endif()
+install(DIRECTORY gtk-3.0 DESTINATION ${KDE_INSTALL_FULL_DATAROOTDIR}/themes/Breeze-Dark)

Breeze-gtk/CMakeLists.txt

@@ -3,8 +3,4 @@ install(DIRECTORY gtk-2.0 DESTINATION ${KDE_INSTALL_FULL_DATAROOTDIR}/themes/Bre
 install(DIRECTORY assets DESTINATION ${KDE_INSTALL_FULL_DATAROOTDIR}/themes/Breeze
         ${directory_EXCLUDES})
 
-if (PKG_GTK_VERSION VERSION_LESS "3.20")
-install(FILES gtk-3.18/gtk.css DESTINATION ${KDE_INSTALL_FULL_DATAROOTDIR}/themes/Breeze/gtk-3.0/)
-else()
-install(FILES gtk-3.20/gtk.css DESTINATION ${KDE_INSTALL_FULL_DATAROOTDIR}/themes/Breeze/gtk-3.0/)
-endif()
+install(DIRECTORY gtk-3.0 DESTINATION ${KDE_INSTALL_FULL_DATAROOTDIR}/themes/Breeze)

CMakeLists.txt

@@ -10,9 +10,6 @@ include(FeatureSummary)
 set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR} "${CMAKE_SOURCE_DIR}/cmake")
 find_package(GTKEngine)
 
-find_package(PkgConfig)
-pkg_check_modules(PKG_GTK REQUIRED gtk+-3.0)
-
 include(KDEInstallDirs)
 
 # Exclude these patterns when installing directories as they have no use