Fix the azure ci test on win32 host.

Author: wenbingl

.azure-pipelines/win32-conda-CI.yml

@@ -56,6 +56,7 @@ jobs:
     displayName: 'Install dependencies'
 
   - script: |
+      set PYTHONPATH=libsvm\python;%PYTHONPATH%
       pip install -e .
       pytest tests --doctest-modules --junitxml=junit/test-results.xml
     displayName: 'pytest'
@@ -64,4 +65,4 @@ jobs:
     inputs:
       testResultsFiles: '**/test-results.xml'
       testRunTitle: 'Python $(python.version)'
-    condition: succeededOrFailed()
+    condition: succeededOrFailed()