usim files

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@7169 818b1a75-f10b-46b9-bf7c-635c3b92a50f

cmake_targets/tools/build_helper

@@ -349,11 +349,15 @@ install_nas_tools() {
   if [ ! -f .ue.nvram ]; then
     echo_success "generate .ue_emm.nvram .ue.nvram"
     ./nvram --gen
+  else
+    [ ./nvram -nt .ue.nvram  -o ./nvram -nt .ue_emm.nvram] && ./nvram --gen
   fi
 
   if [ ! -f .usim.nvram ]; then
     echo_success "generate .usim.nvram"
     ./usim --gen
+  else
+    [ ./usim -nt .usim.nvram ] && ./usim --gen
   fi
 
 }