Revert "Use build_script instead of build section"

This reverts commit 1ad97d6.

Author: Chilipp

appveyor.yml

@@ -51,16 +51,13 @@ install:
   - endlocal
   - "IF NOT DEFINED APPVEYOR_REPO_TAG_NAME (SET GIT_BRANCH=%APPVEYOR_REPO_BRANCH%)"
 
-build_script:
-  - setlocal
-  - set CONDA_REPO_TOKEN=
-  - conda build ci\\conda-recipe --python %PYTHON_VERSION% --no-test
-  - endlocal
+build: false
 
 test_script:
   - setlocal
   - set CONDA_REPO_TOKEN=
   - coverage run -a --source=psyplot_gui setup.py test -a "-v"
+  - "conda build ci\\conda-recipe --python %PYTHON_VERSION% --no-test"
   - endlocal
 
 after_test: