macOS clippy (#526)

* Specifically use bash as a shell to try and get rustup to work on Windows

* Use bash for the call to echo

* Add macOS clippy

* Debug why git diff failed

* Restore macos-latest to matrix

* Allow whitespace before the fact 0 lines were modified

* Add LC_ALL env variable to grep

* Replace usage of -P with -e

.github/actions/build-dependencies/action.yml

@@ -23,6 +23,8 @@ runs:
           sudo apt install -y ca-certificates protobuf-compiler
         elif [ "$RUNNER_OS" == "Windows" ]; then
           choco install protoc
+        elif [ "$RUNNER_OS" == "macOS" ]; then
+          brew install protobuf
         fi
 
     - name: Install solc