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f2e299fb46
Add a ghostty_vt_add_target() CMake function that lets downstream projects build libghostty-vt for a specific Zig target triple. The function encapsulates zig discovery, build-type-to-optimize mapping, the zig build invocation, and output path conventions so consumers do not need to duplicate any of that logic. It creates named IMPORTED targets (e.g. ghostty-vt-static-linux-amd64) that work alongside the existing native ghostty-vt and ghostty-vt-static targets. The build-type mapping is factored into a shared _GHOSTTY_ZIG_OPT_FLAG variable used by both the native build and the new function. The static library targets now propagate c++ as a link dependency on non-Windows platforms, fixing link failures when consumers use static linking with the default SIMD-enabled build. A new example/c-vt-cmake-cross/ demonstrates end-to-end cross- compilation using zig cc as the C compiler, auto-detecting a cross target based on the host OS.