191bf2460d
When using a build.rs script to dynamically generate bindgen bindings at build-time, it will run on the host, and by default bindgen will generate bindings for the host arch/libc instead of the target. To generate the bindings on cross, we need to use BINDGEN_EXTRA_CLANG_ARGS to specify the proper sysroot and include path for the target. These arguments are not used for anything other than bindgen's clang invocation.