making wireguard work on RHEL7/etc.

[Jason A. Donenfeld]

On Tue, Jun 27, 2017 at 1:38 PM,  <wireguard at wut.to> wrote:
> I don't have a system that has that option in it, so no. As it stands
> wg-quick does not work on a RHEL/Amazon AMI instance.

Alright. Would you mind reporting the value of `bash --version` on
there? I don't really like to support bash 3, but maybe I'd be more
open to supporting earlier version of bash 4.