Make explicit that for non-superbuild, plugins go to release-packaging/plugins for easier testing

CMakeLists.txt

@@ -69,7 +69,7 @@ if(NOT fluid_decomposition_POPULATED)
 endif()
 
 set_if_toplevel(VAR CMAKE_LIBRARY_OUTPUT_DIRECTORY 
-                TOPLEVEL "${CMAKE_CURRENT_SOURCE_DIR}/${SC_LIBRARY_OUTPUT_PREFIX}/plugins"
+                TOPLEVEL "${CMAKE_CURRENT_SOURCE_DIR}/release-packaging/plugins"
                 SUPERBUILD "${CMAKE_SOURCE_DIR}/sc_plugins/${CMAKE_HOST_SYSTEM_NAME}/${CMAKE_HOST_SYSTEM_PROCESSOR}")
 
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_DEBUG "${CMAKE_LIBRARY_OUTPUT_DIRECTORY}")