[coreboot] Fixing gitweb links on coreboot.org

[Julius Werner]

> sorry for the late response. I setup forwarders so these links resolve
> to the right location.

Cool, that works, thanks!

The ref-specific links are still broken (e.g. when you click through
from https://review.coreboot.org/admin/projects/coreboot,branches and
get a link like
https://review.coreboot.org/admin/projects/gitweb?p=coreboot.git;a=shortlog;h=refs%2Fheads%2Fmaster),
but as long as we have the other one there's a path to figure it out.
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