rquickjs-sys has no prebuilt FFI bindings for iOS/tvOS targets, so
bindgen needs the matching SDK sysroot (iphoneos/iphonesimulator/
appletvos/appletvsimulator) and clang target triple per cross-compiled
target, or it silently uses the host's own headers and fails. Unverified
here — no Xcode/macOS available in this environment; needs confirming
on a real Mac before relying on it.