v0.4.3 for RN macOS v0.62.x

This release is primarily for building artifacts for React Native for macOS (@alloy in #299). It also Includes the missing vcruntime140_1.dll on Windows, negating the need to install VC++ redistributables separately (@willholen in #310).

Two more artifacts, namely hermes-runtime-darwin and hermes-engine-darwin (a wrapper of the former meant to be consumed by npm), will be included in the release assets from now on.