[PATCH v2 0/4] gitlab-ci: fix the cargo invocation in the Windows job

In https://lore.kernel.org/git/xmqq8q4zosri.fsf@gitster.g/, Junio mentioned that the GitLab CI seems broken since I enabled Rust in the Windows-based CI jobs. This patch series should fix it (lightly tested, but I don't have a whole lot of build minutes on GitLab).

Changes since v1:

 * Reworded the commit messages to clarify previously confusing statements.

Johannes Schindelin (4):
  ci(gitlab,windows): provision GNU Rust for SDK-based MinGW builds
  ci(gitlab,windows): preserve exclusions during dependency setup
  ci(gitlab,windows): fix Rust setup for GitLab's MinGW build
  ci(gitlab,windows): provide GNU Rust's host-linker support

 .gitlab-ci.yml              |  5 ++++-
 ci/install-dependencies.ps1 | 22 ++++++++++++++++------
 2 files changed, 20 insertions(+), 7 deletions(-)

base-commit: d38352cd43ab9745686d697872408bc3249a153f
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-2233%2Fdscho%2Ffix-cargo-in-windows-gitlab-ci-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-2233/dscho/fix-cargo-in-windows-gitlab-ci-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/2233

Range-diff vs v1:

 1:  6a389b2bad ! 1:  cdf2eff480 ci(gitlab,windows): provision GNU Rust for SDK-based MinGW builds
     @@ Metadata
       ## Commit message ##
          ci(gitlab,windows): provision GNU Rust for SDK-based MinGW builds
      
     -    The minimal Git for Windows SDK already supplies Git and GCC. The
     -    MinGW Makefile build needs the GNU Rust toolchain, not another Git
     -    installation or Meson.
     +    The minimal Git for Windows SDK already supplies Git and GCC. The MinGW
     +    Makefile build needs the Rust toolchain that targets GCC (as opposed to
     +    the more common MSVC one), not another Git installation or Meson.
      
     -    Let the dependency installer serve this configuration while keeping
     -    the existing package set for MSVC builds.
     +    Prepare the `install-dependencies.ps1` script to be able to install the
     +    GCC-targeting Rust toolchain.
      
          Assisted-by: GPT-6
          Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
 2:  8855c25128 = 2:  19a4d93181 ci(gitlab,windows): preserve exclusions during dependency setup
 3:  57a83d15fd = 3:  6703fa0349 ci(gitlab,windows): fix Rust setup for GitLab's MinGW build
 4:  1ed79f00cf ! 4:  5310afcdf9 ci(gitlab,windows): provide GNU Rust's host-linker support
     @@ Commit message
          https://gitlab.com/dscho/git1/-/jobs/16593470275
      
          Although gitcore is a static library, Cargo first links `build.rs`
     -    as a host executable. We omitted the GNU MSI's `Gcc` feature, which
     +    as a host executable. We omitted the Rust MSI's `Gcc` feature, which
          supplies the required linker and platform libraries:
          https://github.com/rust-lang/rust/blob/1.96.0/src/etc/installer/msi/rust.wxs