message: Fix for common header changes from jvm.
diff: @@ -148,8 +148,8 @@ codeGen options typeMapping templates file = do
  let (suffix, code) = template mappingContext baseName imports declarations
  let fileName = baseName ++ suffix
  createDirectoryIfMissing True outputDir
  - let content = if (no_banner options) then code else (commonHeader "//" fileName <> code)
  - L.writeFile (outputDir </> fileName) content
  + let content = if (no_banner options) then code else (commonHeader "//" file fileName <> code)
  + LTIO.writeFile (outputDir </> fileName) content
  -- Java's class-per-file and package-as-path requirements make it difficult to
  -- share code with languages where there is a known set of generated files for
  