[fedora-arm] golang support for aarch64 in latest gcc-go

[Peter Robinson]

> Just a note that golang support for aarch64 and ppc64le has landed in
> gcc-go >= 5.0.0-0.19.
>
> I tested the libguestfs golang bindings and it appears to work, at
> least for that (rather simple) case.

Thanks for the tests, we're aware of the functionality, teams are
apparently reviewing suitability for various use cases.

Peter