bazel: Be able to build from other host platform #15
Description
Currently, we only support the x86_64-unknown-linux-gnu host platform. Go (and rules_go) supports a wide range of host targets and we don't cross-compile any Go code so that can currently be run on almost any host platform. Rust (and rules_rust) supports several more platforms (macOS/Darwin and Windows are obvious OSs, along with the aarch64 architecture). We do cross-compile Rust, but it should be fairly easy to add support for more host platforms. C++ will be the most painful to adapt, but only Windows is likely to be difficult.
This shouldn't be much extra work, but it's low priority.