Add Damien Francois fix for lemaitre bug (https://gogs.elic.ucl.ac.be/pbarriat/ecearth_patch/issues/17)

3.3.0/runtime/classic/lemaitre3.sh.tmpl

@@ -23,5 +23,8 @@ set -o nounset
 set -o errexit
 set -x
 
+# Damien Francois fix
+export PSM2_MULTI_EP=0
+
 # Directories
 start_dir=${SLURM_SUBMIT_DIR-$PWD}