Remove obsolete comment from gdbthread.h
A comment in gdbthread.h refers to a global that no longer exists.
Approved-By: Pedro Alves <pedro@palves.net>
diff --git a/gdb/gdbthread.h b/gdb/gdbthread.h
index 7135515..d294be6 100644
--- a/gdb/gdbthread.h
+++ b/gdb/gdbthread.h
@@ -764,7 +764,7 @@ extern int thread_count (process_stratum_target *proc_target);
/* Return true if we have any thread in any inferior. */
extern bool any_thread_p ();
-/* Switch context to thread THR. Also sets the STOP_PC global. */
+/* Switch context to thread THR. */
extern void switch_to_thread (struct thread_info *thr);
/* Switch context to no thread selected. */
