games/zsnes: Replaced backtick cmdsub.

Signed-off-by: B. Watson <urchlay@slackware.uk>

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

games/zsnes/zsnes.SlackBuild

@@ -53,7 +53,7 @@ fi
 
 if [ "$MULTI" = "yes" ]; then
   echo "=== Attempting multilib build on $OLDARCH..."
-  CTEST=$TMP/`mcookie`.c
+  CTEST=$TMP/$( mcookie ).c
   echo 'main(){}' > $CTEST
   if ! gcc -w -m32 -o /dev/null $CTEST 2>/dev/null; then
     echo "*** You don't have multilib installed, bailing."