Please give back golang-github-hashicorp-serf on ppc64el

[Erwan Prioul]

Hello,

I've been able to build the package for few days on ppc64el. Please give back 
golang-github-hashicorp-serf on ppc64el.

gb golang-github-hashicorp-serf_0.6.4~ds1-1 . ppc64el

Thanks.