standalone: Fix run_demo script

- Link main and module*.bc together if using multiple threads
- Fix temporary files not being deleted

nac3standalone/demo/run_demo.sh

@@ -48,11 +48,9 @@ else
 
   clang -c -std=gnu11 -Wall -Wextra -O3 -emit-llvm -o demo.bc demo.c
 
-  if ls module*.bc >/dev/null 2>&1; then
-    llvm-link -o module.bc module*.bc main.bc
-  else
-    llvm-link -o module.bc main.bc
-  fi
+  shopt -s nullglob
+  llvm-link -o module.bc module*.bc main.bc
+  shopt -u nullglob
 
   if [ -z "$outfile" ]; then
     lli --extra-module demo.bc --extra-module irrt.bc module.bc