hikari 5bfd25e60d fix(ci): pin LLVM 18 for Windows cross-compilation (#17) ...

## Summary

The Windows build job has been failing on every PR since the initial release. The root cause is that the default `clang`/`lld`/`llvm` apt packages resolve to an older version of `llvm-rc` that cannot handle PNG-compressed entries in `.ico` files — and all six images in `icon.ico` use PNG compression.

Pinning to `clang-18`, `lld-18`, and `llvm-18` (available in Ubuntu 24.04's default repos) and registering them via `update-alternatives` ensures `llvm-rc`, `clang-cl`, `lld-link`, and friends all resolve to a version that handles the icon resource correctly.

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #17
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

2026-04-13 16:21:42 -07:00

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