[DF] Add a R__LOAD_LIBRARY to help cling find RDF symbols
[DF] Add a R__LOAD_LIBRARY to help cling find RDF symbols

It should fix randomic failures in builds with runtime_cxxmodules=OFF

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root