[Bug go/63539] libgo does not use the newly built objcopy when doing a combined build

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63539

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
ranlib works since the toplevel does:
checking where to find the target ranlib... just compiled

But there is no check for objcopy.