[bug#56872] [PATCH v2] gnu: mu: Update to 1.8.7.

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On Tue Aug 2, 2022 at 8:03 PM BST, muradm wrote:
> I don't have any environment to see if working when
> actually cross-compiling.
You can cross-compile to any architecture you want if you add
`qemu-binfmt-service-type` to your system config and specify
the architectures you want. Then you just need to do something
like:

ʃ guix build --system=aarch64-linux mu
ʃ guix build --system=riscv64-linux mu

Also, on x86-64, you can cross-compile to x86-32 without any
emulation:

ʃ guix build --system=i686-linux mu

    -- (