Windows CI: add vcvarsall setup to fix Windows builds

.azure/ci-windows-job.yml

@@ -66,6 +66,13 @@ jobs:
       python -m pip install -r requirements.txt
     displayName: 'Install Python dependencies'
 
+  - task: BatchScript@1
+    displayName: 'Set up vcvarsall'
+    inputs:
+      filename: 'C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvarsall.bat'
+      arguments: $(python.arch)
+      modifyEnvironment: true
+
   - bash: |
       python build.py --jobs=4 build_wx
     displayName: 'build wxWidgets'