guards scp example

Author: eyck

examples/CMakeLists.txt

@@ -11,6 +11,8 @@ if(NOT USE_CWR_SYSTEMC)
     add_subdirectory(lwtr)
     add_subdirectory(lwtr4tlm2)
     add_subdirectory(lwtr4axi)
-    add_subdirectory(scp)
+    if(WITH_SCP4SCC)
+        add_subdirectory(scp)
+    endif()
 endif()