[multi-tty]: suspicious change in process.c

[Jason Rumney]

In process.c, around line 7045, is the following change (the change is 
the #if 0 block).

      /* Don't do this, it caused infinite select loops.  The display
         method should call add_keyboard_wait_descriptor on stdin if it
         needs that.  */
     #if 0
      FD_SET (0, &input_wait_mask);
     #endif

On Windows, an infinite select loop results from this change (ie, the 
opposite of what the comment says), and in Emacs 22 we clearly do not 
get infinite select loops, so is there some other bug in a multi-tty 
change that reverses the logic here?