Fix check_env calls

gitlab/before_build.sh

@@ -3,12 +3,12 @@
 
 source $(dirname ${0})/functions.sh
 
-check DOCSERVER
-check CONDA_FOLDER
-check PYTHON_VER
-check CONDA_PREFIX
-check ARCH
-check PREFIX
+check_env DOCSERVER
+check_env CONDA_FOLDER
+check_env PYTHON_VER
+check_env CONDA_PREFIX
+check_env ARCH
+check_env PREFIX
 
 WHEELS_REPOSITORY="${DOCSERVER}/software/bob/wheels/gitlab/"
 WHEELS_SERVER=`echo ${DOCSERVER} | sed 's;https\?://;;'`