libghostty-vt-sys (Turborepo patch)

Vendored copy of libghostty-vt-sys 0.2.0 with Windows MSVC static-linking and portable CPU-target fixes.

Upstream 0.2.0 emits static=ghostty-vt, which MSVC resolves to ghostty-vt.lib — the DLL import library rather than the static archive. That leaves turbo.exe depending on ghostty-vt.dll at runtime.

This patch links ghostty-vt-static.lib on Windows MSVC instead, matching vercel/turborepo#13171.

Vendored builds also pass -Dcpu=baseline, as recommended by Ghostty for distributed artifacts. Without it, Zig targets the build machine's native CPU and the resulting turbo binary can crash with an illegal instruction on older CPUs.

Activated via [patch.crates-io] in the workspace root Cargo.toml. Remove this crate once upstream libghostty-vt-sys includes both fixes.