Cygwin: pty: Fix state mismatch caused in octave gui.

- In octave gui, sometimes state mismatch between real pty state
  and state variable occurs. For example, this occurs when 'ls'
  command is executed in octave gui. This patch fixes the issue.

winsup/cygwin/spawn.cc

@@ -947,6 +947,15 @@ child_info_spawn::worker (const char *prog_arg, const char *const *argv,
     {
       FreeConsole ();
       AttachConsole (pid_restore);
+      cygheap_fdenum cfd (false);
+      int fd;
+      while ((fd = cfd.next ()) >= 0)
+	if (cfd->get_major () == DEV_PTYS_MAJOR)
+	  {
+	    fhandler_pty_slave *ptys =
+	      (fhandler_pty_slave *) (fhandler_base *) cfd;
+	    ptys->fixup_after_attach (false, fd);
+	  }
     }
 
   return (int) res;