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vt: increase buffer size

This patch increases the buffer sizes in vt(1) to reduce
the latency from the roundtrip between terminal and cpu
server.

--- a/sys/src/cmd/vt/cons.h

+++ b/sys/src/cmd/vt/cons.h

@@ -8,7 +8,7 @@

 extern Consstate cs[];

 #define	INSET	2

-#define	BUFS	32

+#define	BUFS	256

 #define	HISTSIZ	(64*1024)	/* number of history characters */

 #define BSIZE	(8*1024)

--- a/sys/src/cmd/vt/main.c

+++ b/sys/src/cmd/vt/main.c

@@ -311,7 +311,7 @@

 		sysfatal("initkeyboard failed: %r");

 	hc[0] = chancreate(sizeof(char*), 256);	/* input to host */

-	hc[1] = chancreate(sizeof(Rune*), 8);	/* output from host */

+	hc[1] = chancreate(sizeof(Rune*), 256);	/* output from host */

 	cs->raw = rflag;