Fix Windows Vulkan native runtime release build

[i386]

What changed

Prioritize the MinGW compiler runtime directory on PATH before configuring Windows Vulkan llama.cpp builds.

Root cause

The release job Build native runtime Windows x86_64 Vulkan built vulkan-shaders-gen.exe with the runner's MinGW GCC 14 toolchain, then launched it with the LunarG Vulkan SDK Bin directories earlier on PATH. Those directories include older GCC runtime DLLs, so Windows loaded an incompatible libstdc++ and the helper exited with STATUS_ENTRYPOINT_NOT_FOUND (0xc0000139) while generating shaders.

The compiler directory is now placed first for MinGW/MSYS/Cygwin Vulkan builds only. The Vulkan SDK remains on PATH, so glslc discovery is unchanged. Other platforms and backends are unaffected.

Impact

Windows x86_64 Vulkan native runtime packaging can generate the embedded Vulkan shaders and complete the release artifact.

Validation

• bash -n scripts/build-llama.sh
• shellcheck scripts/build-llama.sh
• git diff --check
• just check-release
• just build

The exact Windows failure path requires a Windows runner and will be verified by PR/release CI.

Summary by CodeRabbit

• Bug Fixes
  • Improved Vulkan builds on MinGW, MSYS, and Cygwin environments.
  • Prevented incompatible runtime libraries from being selected during builds, improving build reliability.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 27dd7c6f-2e3f-42cb-8af0-28223b5eeb45

📥 Commits

Reviewing files that changed from the base of the PR and between 6145c9b and 30ba767.

📒 Files selected for processing (1)

• scripts/build-llama.sh

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📝 Walkthrough

Walkthrough

The Vulkan build script now prioritizes the active MinGW runtime on MinGW, MSYS, and Cygwin environments by locating g++, prepending its directory to PATH, and printing a status message.

Changes

Vulkan runtime path selection

Layer / File(s)	Summary
Prioritize the MinGW runtime scripts/build-llama.sh	Adds environment-specific PATH adjustment for Vulkan builds before sccache and CMake configuration.

Estimated code review effort: 1 (Trivial) | ~5 minutes

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jd/fix-windows-vulkan-release

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[github-actions]

This pull request is currently a draft. Reviews will not take place until the PR is marked as ready for review.