Bash chokes up on the tty mode when it terminates.

[Kazuhiro Fujieda]

I found bash choked up on the tty mode when it terminated.
I tested it on NT4 Sp6a with recent nightly snapshots and the
latest CVS source. The concrete procedure is:
1. Insert `set CYGWIN=tty' into the cygwin.bat.
2. Start Cygwin Bash Shell
3. Exit immediately from it.

The strace log attached below shows it choked up just after
it invoked kill_pgrp.
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