- fixed .x file permissions

- implemented -strict mode if statement
- added readfile() to sys pkg
- removed outdated sys.go

SVN=125572

src/lib/sys.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.
-
-package sys
-
-func	modf(a double) (x double, y double);
-func	frexp(a double) (e int, m double);
-func	ldexp(f double, e int) double;
-
-func	Inf(n int) double;
-func	NaN() double;
-func	isInf(arg double, n int) bool;
-
-export	modf, frexp, ldexp
-export	NaN, isInf, Inf