Freeze OSX castxml version to 0.2.0

azure-pipelines.yml

@@ -68,7 +68,7 @@ jobs:
     inputs:
       script: |
         brew update
-        brew install castxml
+        brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/8a004a91a7fcd3f6620d5b01b6541ff0a640ffba/Formula/castxml.rb
 
   - task: CmdLine@2
     displayName: 'Install Nuke'