[gold commit] PR gold/16870: Add missing break statement.

[Cary Coutant]

> 2014-04-23  Cary Coutant  <ccoutant@google.com>
>
> gold/
>         PR gold/16870
>         * x86_64.cc (Target_x86_64::Relocate::relocate): Add missing break.

I've also backported this patch to the binutils-2_24_branch.

-cary