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ip/ppp: increase echo timeout to 5 periods (25 seconds)

I get every hour a delay of the echo replies for as
long as 20 seconds causing reconnects.

It does recover however and sends all the replies
eventually.

--- a/sys/src/cmd/ip/ppp/ppp.h

+++ b/sys/src/cmd/ip/ppp/ppp.h

@@ -172,7 +172,7 @@

 	Period=		5*1000,	/* period of retransmit process (in ms) */

 	Timeout=	20,	/* xmit timeout (in Periods) */

-	Echotimeout=	2,	/* echo timeout (in Periods) */

+	Echotimeout=	5,	/* echo timeout (in Periods) */

 	Buflen=		4096,

 	MAX_STATES=	16,		/* van jacobson compression states */