I just had the following CL fail in Jenkins:
https://review.coreboot.org/c/coreboot/+/25393

It fails for GOOGLE_CHELL but the one file it touches doesn't even get
compiled for that board. I'm not quite sure that to make of the error but
it seems to be a problem with building the Chrome EC code in 3rdparty. (I
guess we don't log the full build output for subinvocations of make in
Jenkins?)

I've rebased the CL so let's hope it works on the next attempt... but in
the meantime, can anybody figure out what's wrong here and how we can fix
it? (Maybe a flaky build failure related to parallel builds?)