message: fix(itk-wasm-cli.js): Use path.join to construct dockcrossScript
  Otherwise we can end up with `//` in the path, which causes issues down
  the line.
diff: @@ -60,7 +60,7 @@ function processCommonOptions() {
  }
  // Ensure we have the 'dockcross' Docker build environment driver script
  - const dockcrossScript = `${buildDir}/itk-wasm-build-env`
  + const dockcrossScript = path.join(buildDir, 'itk-wasm-build-env')
  try {
  fs.statSync(dockcrossScript)
  } catch (err) {
  