rt: rust_sched_launcher does not need a join() method

Author: brson

src/rt/rust_sched_launcher.h

@@ -19,7 +19,6 @@ class rust_sched_launcher : public kernel_owned<rust_sched_launcher> {
     rust_sched_launcher(rust_scheduler *sched, rust_srv *srv, int id);
 
     virtual void start() = 0;
-    virtual void run()  = 0;
     virtual void join() = 0;
     rust_sched_loop *get_loop() { return &sched_loop; }
 };