They are used from CI workflows to ensure that the binaries are reproducible.
In theory they could be changed to compare the sha256sum files for the archive
files too, but it's too much of a hassle to create reproducible archive files.
The code for passing -buildmode=pie in buildall.sh didn't actually work -
"go env GOOS GOARCH" outputs two lines, while the grep pattern expects one line.
The buildall.elv script implements this correctly, and as a result this exposes
the fact that passing -buildmode=pie requires some extra work for
reproducibility - among other things, it causes the binaries to be dynamically
linked.
Just disable it for now to get reproducibility. We're not losing anything as
that was the (unintended) old behavior of buildall.sh anyway.
