Stop bundling libraries in release

- Instead we now use CentOS 7 for the static build to guarantee
  that we only depend on libc v2.17

- For macOS we now pull in a static node binary and bundle that instead.

ci/steps/release-packages.sh

@@ -4,6 +4,11 @@ set -euo pipefail
 main() {
   cd "$(dirname "$0")/../.."
 
+  if [[ "$OSTYPE" == darwin* ]]; then
+    curl -L https://nodejs.org/dist/v14.4.0/node-v14.4.0-darwin-x64.tar.gz | tar -xz
+    PATH="$PATH:node-v14.4.0-darwin-x64/bin"
+  fi
+
   # https://github.com/actions/upload-artifact/issues/38
   tar -xzf release-npm-package/package.tar.gz