sys.readfile has been removed. Remove the test case for it.

It was disabled last week anyhow.

R=r,rsc
DELTA=24  (0 added, 24 deleted, 0 changed)
OCL=23205
CL=23220

test/readfile.go

-// 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.
-
-// # $G $F.go && $L $F.$A && ./$A.out readfile.go
-// # This is some data we can recognize
-
-package main
-
-func main() {
-	var s string;
-	var ok bool;
-
-	s, ok = sys.readfile("readfile.go");
-	if !ok {
-		print("couldn't readfile\n");
-		sys.Exit(1)
-	}
-	start_of_file :=
-		"// $G $F.go && $L $F.$A && ./$A.out readfile.go\n" +
-		"// # This is some data we can recognize\n" +
-		"\n" +
-		"package main\n";
-	if s[0:102] != start_of_file {
-		print("wrong data\n");
-		sys.Exit(1)
-	}
-}