rust-team branch merged

[Efraim Flashner <efraim@flashner.co.il>]

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The rust team is pleased to announce that the rust-team branch has been
merged back into master.  There are 570 commits across the branch.
Cross-compiling support for the cargo-build-system was added, including
for librsvg.  Cross-compiling was tested for (nearly) all architectures
supported in `guix build --list-targets`.  Upstream rust added
'i686-unknown-hurd-gnu' as a target in rust-1.74, so that will need to
wait until another time.  In the meantime, x86_64-w64-mingw32 at least
compiles correctly and tests well under wine.

Notable notes:

* New rust version is 1.73.
* 4001 packages use the cargo-build-system
* Rust crates produced in the 'package' phase of the cargo-build-system
should now be reproducible (for real this time)
* Packages added: eza, kibi, libgit2-1.6, libgit2-1.7, spotifyd, stgit-2
* Packages updated: alfis, rust-analyzer, rust-cargo-c
* Rust-analyzer is built from the rust sources now, updating it to 1.73.
It can be installed as 'rust-analyzer' or as 'rust:tools'
* Cross-compiling support for the cargo-build-system was added

Additional notes:

* crates.io no longer accepts '-' instead of '_' in crate lookups, so
there are a (probably large) number of packages which need to have their
source adjusted.

* Compiled rust packages currently have a 'package' phase, which runs
the command used to crate a 'crate tarball', and is installed in
%output/share/cargo/registry, with unpacked sources in
%output/share/cargo/src.  In theory it should be possible to use these
for local rust development.  The benefits include everything that comes
with being a guix package, including pre-patched shebangs.  Currently no
index file is created in $GUIX_ENVIRONMENT/share/cargo/registry/index,
which is likely necessary to actually make use of this.  Additionally, I
am unsure how to use '$GUIX_ENVIRONMENT' in ~/.cargo/config so that it
is expanded and not taken as a literal string.

-- 
Efraim Flashner   <efraim@flashner.co.il>   רנשלפ םירפא
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