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Guix Introduction
This PR enables building bitcoin in Guix containers. Guix is a transactional package manager much like Nix, but unlike Nix, it has more of a focus on bootstrappability and reproducibility which are attractive for security-sensitive projects like bitcoin.
Guix Build Walkthrough
In this PR, we define a Guix manifest in contrib/guix/manifest.scm, which declares what packages we want in our environment.
We can then invoke
guix environment --manifest=contrib/guix/manifest.scm --container --pure --no-grafts --no-substitutes

To have Guix:

Build an environment containing the packages we defined in our contrib/guix/manifest.scm manifest from the Guix bootstrap binaries (see bootstrappability for more details).
Start a container with that environment that has no network access, and no access to the host's filesystem except to the pwd that it was started in.
Drop you into a shell in that container.

Note: if you don't want to wait hours for Guix to build the entire world from scratch, you can eliminate the --no-substitutes option to have Guix download from available binary sources. Note that this convenience doesn't necessarily compromise your security, as you can check that a package was built correctly after the fact using guix build --check

Therefore, we can perform a build of bitcoin much like in Gitian by invoking the following:
make -C depends -j"$(nproc)" download && \
cat contrib/guix/ | guix environment --manifest=contrib/guix/manifest.scm --container --pure --no-grafts --no-substitutes

We don't include make -C depends -j"$(nproc)" download inside contrib/guix/ because contrib/guix/ is run inside the container, which has no network access (which is a good thing).
I believe that this represents a substantial improvement for the "supply chain security" of bitcoin because:

We no longer have to rely on Ubuntu for our build environment for our releases (oh the horror), because Guix builds everything about the container, we can perform this on almost any Linux distro/system.
It is now much easier to determine what trusted binaries are in our supply chain, and even make a nice visualization! (see bootstrappability).
There is active effort among Guix folks to minimize the number of trusted binaries even further. OriansJ's stage0, and janneke's Mes all aim to achieve reduced binary boostrap for Guix. In fact, I believe if OriansJ gets his way, we will end up some day with only a single trusted binary: hex0 (a ~500 byte self-hosting hex assembler).

Steps to Completion

Successfully build bitcoin inside the Guix environment
Make check-symbols pass (HELP WANTED HERE)
Document build process for future releases
Extra: Pin the revision of Guix that we build with with Guix inferiors

Help Wanted
As of now, the command described above to perform a build of bitcoin a lot like Gitian works, but fails at the check-symbols stage. This is because a few dynamic libraries are linked in that shouldn't be.
Here's what ldd src/bitcoind looks like when built in a Guix container: (0x00007ffcc2d90000) => /gnu/store/h90vnqw0nwd0hhm1l5dgxsdrigddfmq4-glibc-2.28/lib/ (0x00007fb7eda09000) => /gnu/store/h90vnqw0nwd0hhm1l5dgxsdrigddfmq4-glibc-2.28/lib/ (0x00007fb7ed9ff000) => /gnu/store/4sqps8dczv3g7rwbdibfz6rf5jlk7w90-gcc-5.5.0-lib/lib/ (0x00007fb7ed87c000) => /gnu/store/h90vnqw0nwd0hhm1l5dgxsdrigddfmq4-glibc-2.28/lib/ (0x00007fb7ed85b000) => /gnu/store/h90vnqw0nwd0hhm1l5dgxsdrigddfmq4-glibc-2.28/lib/ (0x00007fb7ed6da000) => /gnu/store/4sqps8dczv3g7rwbdibfz6rf5jlk7w90-gcc-5.5.0-lib/lib/ (0x00007fb7ed6bf000) => /gnu/store/h90vnqw0nwd0hhm1l5dgxsdrigddfmq4-glibc-2.28/lib/ (0x00007fb7ed506000)
/gnu/store/h90vnqw0nwd0hhm1l5dgxsdrigddfmq4-glibc-2.28/lib/ => /usr/lib64/ (0x00007fb7ee3a0000)

And here's what it looks in one of our releases: (0x00007ffff52cd000) => /usr/lib/ (0x00007f87726b4000) => /usr/lib/ (0x00007f87726aa000) => /usr/lib/ (0x00007f8772525000) => /usr/lib/ (0x00007f877250b000) => /usr/lib/ (0x00007f8772347000)
/lib64/ => /usr/lib64/ (0x00007f8773392000)

I suspect it is because my script does not apply the gitian-input patches described in the release process but there is no description as to how these patches are applied. It might also be something else entirely.
Edit: It is something else. It appears that the gitian inputs are only used by gitian-win-signer.yml
How to Help

Install Guix on your distro either from source or perform a binary installation
Try out my branch and the command described above!

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