Try strategy for venv fix (py3, bis)

gitlab/before_build.sh

@@ -60,6 +60,3 @@ else
   log_error "No bootstrap-buildout.py file found, stopping..."
   exit 1
 fi
-
-# Corrects the virtualenv to take LD_LIBRARY_PATH into account
-fix_venv

gitlab/build.sh

@@ -3,7 +3,10 @@
 
 source $(dirname ${0})/functions.sh
 
-run_cmd ./bin/buildout
+run_cmd_ld ./bin/buildout
+
+# Corrects the virtualenv to take LD_LIBRARY_PATH into account
+fix_venv
 
 if [ -x ./bin/bob_dbmanage.py ]; then
   run_cmd ./bin/bob_dbmanage.py all download --force;