powerpc64[le]-linux port progress

[dftxbs3e]

Hello!
So here's my current tree:
https://gitlab.com/lle-bout/guix - master branch
Bootstrap binaries are uploaded over LFS at:
https://gitlab.com/lle-bout/guix-bootstrap - master branch
The current issue is during 'glibc-intermediate' in gnu/packages/commencement.scm
The statically linked gawk binary tries to execute:
execve("/gnu/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-bash-static-5.0.7/bin/bash", ["sh", "-c", "test -d nptl"], 0x3fffd261ecc0 /* 57 vars */) = -1
According to Ludovic Courtes, store references with 'eeeeeee' characters in them are removed store references.
So I went and tried to strip the reference to bash and replace it with `sh` so that either gawk or any of its dependency can look up `sh` in PATH at bootstrap time (we do not know any path yet).
In the commit history, you can see I tried to patch glibc and gawk, but that does not solve the problem.
The final gawk binary still contains a reference to bash-static, and I have no idea where it comes from.
Do note that during gawk build process, there's a 'set-shell-filename phase, that I removed in gnu/packages/make-bootstrap.scm and instead replace every occurrence of /bin/sh with `sh`.

I would appreciate help here.

Thank you

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