t/qemu-runlinux: Issue terminal resize before running program

Else program inside sees default terminal settings to be 80x25,
while after the patch it sees correct settings.

Still something is not completely right with terminal settings, as e.g.
vsplit is not working correctly in vim (vertical ruler is not straight).

t/qemu-runlinux

@@ -75,7 +75,7 @@ if [ $$ == 1 ]; then
 	#env
 	#set -x
 	set +e
-	setsid "$@" <>/dev/ttyS0 >&0 2>&1	# run argv[1:] passed to init
+	setsid "$0" .qinit2 "$@" <>/dev/ttyS0 >&0 2>&1	# run qinit2 with argv[1:] passed to init
 	echo "exit code: $?"
 
 	qshutdown
@@ -83,6 +83,17 @@ if [ $$ == 1 ]; then
 	qdie "unreachable"
 fi
 
+# init part spawned from under setsid.
+# $0 .qinit2 <command> ...
+if [ "$1" == .qinit2 ]; then
+	# resize terminal to current host's xterm
+	command -v resize >/dev/null && eval `resize`
+
+	# tail to argv[1:] passed to init
+	shift
+	exec "$@"
+fi
+
 
 # ---- qemu setup ----