test/initsyscall.go: delete

It's testing an old property of the language and is no longer relevant.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5676104

test/initsyscall.go

-// run
-
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// This used to crash because the scheduler
-// tried to kick off a new scheduling thread for f
-// when time.Nanoseconds went into the system call.
-// It's not okay to schedule new goroutines
-// until main has started.
-
-package main
-
-import "time"
-
-func f() {
-}
-
-func init() {
-	go f()
-	time.Now()
-}
-
-func main() {
-}