Add packages for clippy build to run (#24)

.github/workflows/lint.yaml

@@ -40,6 +40,12 @@ jobs:
           components: clippy
       - name: Print installed Rust toolchains
         run: rustup toolchain list
+      - name: Install required non-Rust build tools
+        uses: awalsh128/cache-apt-pkgs-action@latest
+        with:
+          # TODO: check if we need all the packages below -- this list comes from the Libra build setup script
+          packages: build-essential lld pkg-config libssl-dev libgmp-dev clang
+          version: 1.0 # This is a cache key -- change it when you change the package list above
       - name: Run cargo fmt
         if: env.ENABLE_RUSTFMT == 'True'
         # Note the hacky +nightly below