Missing ^Q in 4.1a

[Alan S. Watt]

This is a long-standing bug in the tty driver from V7 days.  I have
reported it several times to Berkeley, apparently without getting to
the attention of anyone in a position to do anything about it. I will
mail you the fix (relative to 4.1 sources), or can post if necessary.

Changes affect:

	/sys/dev/tty.c
	/sys/dev/ttynew.c
	/sys/dev/ttyold.c

As I don't have 4.2 sources, the changes may have to be integrated
pretty much by hand, as the kernel source organization changed
considerably.  Total changes affect ~10 lines of original source.

	- Alan S. Watt
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