plasma build fix without qtopeng

Index: kdebase/workspace/libs/plasma/CMakeLists.txt===================================================================--- kdebase/workspace/libs/plasma/CMakeLists.txt	(revision 734904)+++ kdebase/workspace/libs/plasma/CMakeLists.txt	(working copy)@@ -77,11 +77,11 @@  kde4_add_library(plasma SHARED ${plasma_LIB_SRCS}) -target_link_libraries(plasma ${KDE4_KIO_LIBS} ${QT_QTOPENGL_LIBRARY} ${QT_QTUITOOLS_LIBRARY})+target_link_libraries(plasma ${KDE4_KIO_LIBS} ${QT_QTUITOOLS_LIBRARY}) -if(OPENGL_FOUND)-target_link_libraries(plasma ${OPENGL_gl_LIBRARY})-endif(OPENGL_FOUND)+if(QT_QTOPENGL_FOUND AND OPENGL_FOUND)+target_link_libraries(plasma ${QT_QTOPENGL_LIBRARY} ${OPENGL_gl_LIBRARY})+endif(QT_QTOPENGL_FOUND AND OPENGL_FOUND)  set_target_properties(plasma PROPERTIES VERSION 1.0.0 SOVERSION 1) install(TARGETS plasma DESTINATION ${LIB_INSTALL_DIR})