making wireguard work on RHEL7/etc.

[wireguard at wut.to]

Jason A. Donenfeld wrote:

> 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.

GNU bash, version 4.2.46(1)-release (x86_64-redhat-linux-gnu)