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[PATCH] clear ixon termios flag on initialization

Otherwise ctrl-S/Q gets intercepted by the tty layer instead of
handled by uemacs.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
diff --git a/posix.c b/posix.c
index 97edd9f052b1..352c4712b689 100644
--- a/posix.c
+++ b/posix.c
@@ -53,17 +53,17 @@ void ttopen(void)
 	/*
 	 * base new settings on old ones - don't change things
 	 * we don't know about
 	 */
 	ntermios = otermios;
 
 	/* raw CR/NL etc input handling, but keep ISTRIP if we're on a 7-bit line */
 	ntermios.c_iflag &= ~(IGNBRK | BRKINT | IGNPAR | PARMRK
-			      | INPCK | INLCR | IGNCR | ICRNL);
+			      | INPCK | INLCR | IGNCR | ICRNL | IXON);
 
 	/* raw CR/NR etc output handling */
 	ntermios.c_oflag &=
 	    ~(OPOST | ONLCR | OLCUC | OCRNL | ONOCR | ONLRET);
 
 	/* No signal handling, no echo etc */
 	ntermios.c_lflag &= ~(ISIG | ICANON | XCASE | ECHO | ECHOE | ECHOK
 			      | ECHONL | NOFLSH | TOSTOP | ECHOCTL |