[libkwineffects] Improving linking of kwinglutils library

Only needs:
* Qt5::DBus for the communication with color correction
* Qt5::X11Extras for access to XCB, pulls in needed Qt5::Gui
* XCB component XCB for xcb calls in kwinglobals.h

libkwineffects/CMakeLists.txt

@@ -50,7 +50,7 @@ macro( KWIN4_ADD_GLUTILS_BACKEND name glinclude )
         include_directories(${OPENGLES_EGL_INCLUDE_DIR})
     endif()
     add_library(${name} SHARED ${kwin_GLUTILSLIB_SRCS})
-    target_link_libraries(${name} PUBLIC ${kwineffects_QT_LIBS} ${kwineffects_XCB_LIBS} kwineffects)
+    target_link_libraries(${name} PUBLIC Qt5::DBus Qt5::X11Extras ${XCB_XCB_LIBRARY})
     if(OPENGL_EGL_FOUND)
        target_link_libraries(${name} PRIVATE ${OPENGLES_EGL_LIBRARY})
     endif()