Remove useless building libs installation

.drone.yml

@@ -3,7 +3,6 @@ env:
   - POSTGRESQL_URI=postgresql://postgres@127.0.0.1:5432/
   - MYSQL_URI=mysql://root@127.0.0.1:3306/
 script:
-  - sudo apt-get install python-dev libldap2-dev libsasl2-dev libssl-dev
   - pip install tox
   - tox -e sqlite,postgresql
 services: