Disable PythonQt wrapping for CTKDummyPlugin library

It doesn't make sens to wrap or export this target to other project

Libs/Core/Testing/Cpp/CMakeLists.txt

@@ -7,6 +7,7 @@ ctkMacroBuildLib(
   MOC_SRCS "ctkDummyPlugin.h"
   TARGET_LIBRARIES ${CTK_BASE_LIBRARIES}
   LIBRARY_TYPE "SHARED"
+  DISABLE_WRAP_PYTHONQT
   )
 GET_TARGET_PROPERTY(ctkDummyPluginPATH "CTKDummyPlugin" LOCATION)
 REMOVE_DEFINITIONS(-DCTKDummyPlugin)