Overwrite waiton_ptid in nbsd-nat, rather than generic core

This avoids compatibility issues with remote access to !NetBSD platform.

external/gpl3/gdb/dist/gdb/infrun.c

@@ -3874,11 +3874,7 @@ fetch_inferior_event (void *client_data)
   struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
   struct cleanup *ts_old_chain;
   int cmd_done = 0;
-#if defined(__NetBSD__)
-  ptid_t waiton_ptid = inferior_ptid;
-#else
   ptid_t waiton_ptid = minus_one_ptid;
-#endif
 
   memset (ecs, 0, sizeof (*ecs));
 

external/gpl3/gdb/dist/gdb/nbsd-nat.c

@@ -360,6 +360,17 @@ nbsd_wait (struct target_ops *ops,
 {
   ptid_t wptid;
 
+  /*
+   * Always perform polling on exact PID, overwrite the default polling on
+   * WAIT_ANY.
+   *
+   * This avoids events reported in random order reported for FORK / VFORK
+   * when child and parent events are otherwise reported in random order.
+   *
+   * Polling on traced parent always simplifies the code.
+   */
+  ptid = inferior_ptid;
+
   if (debug_nbsd_lwp)
     fprintf_unfiltered (gdb_stdlog, "NLWP: calling super_wait (%d, %ld, %ld) target_options=%#x\n",
                         ptid_get_pid (ptid), ptid_get_lwp (ptid),