vendor: adding in golang.org/x/sys/unix package

This commit adds in the golang.org/x/sys/unix package. This package
provides a low-level interface to unix syscalls. We will uses this
package instead of the built-in "syscall" package because the syscall
package is locked down (https://golang.org/pkg/syscall) and is not
exposing any new kernel functionality.

In fact, this is actually a patched version of the x/sys/unix package
pending review (first part: https://go-review.googlesource.com/c/37943).
The version included in this commit exposes all of the filesystem
encryption kernel interfaces to Go code.

Change-Id: Ic5f9c98b858ccb00db97502c9a60e9249aa8ba38

1 files changed, 27 insertions, 0 deletions

diff --git a/vendor/golang.org/x/sys/unix/env_unix.go b/vendor/golang.org/x/sys/unix/env_unix.go
new file mode 100644
index 0000000..45e281a
--- /dev/null
+++ b/vendor/golang.org/x/sys/unix/env_unix.go
@@ -0,0 +1,27 @@
+// Copyright 2010 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 darwin dragonfly freebsd linux netbsd openbsd solaris
+
+// Unix environment variables.
+
+package unix
+
+import "syscall"
+
+func Getenv(key string) (value string, found bool) {
+	return syscall.Getenv(key)
+}
+
+func Setenv(key, value string) error {
+	return syscall.Setenv(key, value)
+}
+
+func Clearenv() {
+	syscall.Clearenv()
+}
+
+func Environ() []string {
+	return syscall.Environ()
+}