Draft: ci(gitlab,windows): provision GNU Rust for SDK-based MinGW builds

Karthik Nayakrequested to merge
windows-rust-fix into master

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.

Let the dependency installer serve this configuration while keeping the existing package set for MSVC builds.

Assisted-by: GPT-6 Signed-off-by: Johannes Schindelin johannes.schindelin@gmx.de

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