Travis gives us a venv but no VIRTUAL_ENV variable.

JulienPalard · JulienPalard · commit bbf0c58467d9 · 2018-10-05T18:37:21.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -8,4 +8,4 @@ install:
   - pospell --version
 script:
   - pospell -p dict -l fr **/*.po
-  - deactivate; make CPYTHON_CLONE=/tmp/cpython/ BRANCH=3.7 VENV=${VIRTUAL_ENV}
+  - deactivate; make CPYTHON_CLONE=/tmp/cpython/ BRANCH=3.7
