rt: Remove rust_scheduler::interrupt_flag. Unused

src/rt/rust_scheduler.cpp

@@ -18,7 +18,6 @@ rust_scheduler::rust_scheduler(rust_kernel *kernel,
                                rust_srv *srv,
                                int id) :
     ref_count(1),
-    interrupt_flag(0),
     _log(srv, this),
     log_lvl(log_debug),
     srv(srv),
@@ -274,8 +273,6 @@ rust_scheduler::start_main_loop() {
 
         place_task_in_tls(scheduled_task);
 
-        interrupt_flag = 0;
-
         DLOG(this, task,
              "Running task %p on worker %d",
              scheduled_task, id);

src/rt/rust_scheduler.h

@@ -45,9 +45,6 @@ struct rust_scheduler : public kernel_owned<rust_scheduler>,
 {
     RUST_REFCOUNTED(rust_scheduler)
 
-    // Fields known to the compiler:
-    uintptr_t interrupt_flag;
-
     // Fields known only by the runtime:
     rust_log _log;