Implementation changed in https://golang.org/cl/23612.
Updates #15810
Change-Id: I8fff9e3aa3e54162546bb9ec1cc2ebba2b6d9fed
Reviewed-on: https://go-review.googlesource.com/23614
Reviewed-by: Ian Lance Taylor <iant@golang.org>
<a href="/pkg/syscall/#SysProcAttr"><code>SysProcAttr</code></a> struct
(as used in
<a href="/pkg/os/exec/#Cmd"><code>os/exec.Cmd</code></a>'s <code>SysProcAttr</code> field)
-has a new <code>Unshare</code> field.
+has a new <code>Unshareflags</code> field.
If the field is nonzero, the child process created by
<a href="/pkg/syscall/#ForkExec"><code>ForkExec</code></a>
(as used in <code>exec.Cmd</code>'s <code>Run</code> method)