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samterm: use 4K stacks for amd64 (thanks burnzez)

we got a stack overflow on the hostproc on amd64 overflowing
by arround 200 byte. so just use 4K stacks for everything.

--- a/sys/src/cmd/samterm/plan9.c

+++ b/sys/src/cmd/samterm/plan9.c

@@ -9,6 +9,10 @@

 #include "flayer.h"

 #include "samterm.h"

+enum {

+	STACK = 4096,

+};

+

 static char exname[64];

 void

@@ -172,7 +176,7 @@

 	plumbc = chancreate(sizeof(int), 0);

 	arg[0] = plumbc;

 	arg[1] = &p[1];

-	proccreate(extproc, arg, 1024);

+	proccreate(extproc, arg, STACK);

 	atexit(removeextern);

 }

@@ -264,7 +268,7 @@

 	}

 	arg[0] =plumbc;

 	arg[1] = &fd;

-	proccreate(plumbproc, arg, 4096);

+	proccreate(plumbproc, arg, STACK);

 	return 1;

 }

@@ -299,5 +303,5 @@

 hoststart(void)

 {

 	hostc = chancreate(sizeof(int), 0);

-	proccreate(hostproc, hostc, 1024);

+	proccreate(hostproc, hostc, STACK);

 }