plan9: make pwd process-wide on Plan 9

From main repo: https://go-review.googlesource.com/#/c/6350
                https://go-review.googlesource.com/#/c/6385

Change-Id: Ieba5ff60fc501be9aa4739860c8fe026f8b3eb67
Reviewed-on: https://go-review.googlesource.com/8721
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

plan9/pwd_plan9.go

@@ -0,0 +1,23 @@
+// Copyright 2015 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.
+
+// +build !go1.5
+
+package plan9
+
+func fixwd() {
+}
+
+func Getwd() (wd string, err error) {
+	fd, err := open(".", O_RDONLY)
+	if err != nil {
+		return "", err
+	}
+	defer Close(fd)
+	return Fd2path(fd)
+}
+
+func Chdir(path string) error {
+	return chdir(path)
+}