allow to override the MAKEOPTS

vars/helper.groovy

@@ -152,7 +152,7 @@ def doBuild(String label, String buildType) {
       sudo -u msk_jenkins mkdir -p /scratch/install
       cd /scratch/build-${JOB_NAME}
       sudo -u msk_jenkins cmake /scratch/source -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=${buildType} -DSUPPRESS_AUTO_DOC_BUILD=true \${CMAKE_EXTRA_ARGS}
-      sudo -u msk_jenkins make $MAKEOPTS
+      sudo -u msk_jenkins make \${MAKEOPTS}
     """
   }
   script {