Build Rust projects reliably on Windows and during cross-compilation

Rust builds are now reliable on Windows and during cross-compilation. Windows rustc invocations that exceeded the CreateProcess command-line limit are routed through response files. Quoted feature cfg values are preserved, build scripts and proc macros are handled without relying on Unix shell wrappers, and Cargo metadata is collected for both host and target platforms. Linux ARM release builds also get the linker tools they need, and the prelude correctly resolves Windows registry paths to custom build scripts.