Fix make new-role: brace expansion fails under dash

The mkdir used shell brace expansion {tasks,handlers,...}, which /bin/sh (dash)
does not support, so new-role created one literally-named dir and then errored.
make new-role had never worked on this host. Use explicit mkdir paths.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Makefile

@@ -146,7 +146,9 @@ new-role:
 ifndef NAME
 	$(error NAME is required: make new-role NAME=<rolename>)
 endif
-	mkdir -p roles/$(NAME)/{tasks,handlers,defaults,templates,files,meta,molecule/default}
+	mkdir -p roles/$(NAME)/tasks roles/$(NAME)/handlers roles/$(NAME)/defaults \
+	         roles/$(NAME)/templates roles/$(NAME)/files roles/$(NAME)/meta \
+	         roles/$(NAME)/molecule/default
 	echo "---" > roles/$(NAME)/tasks/main.yml
 	echo "---" > roles/$(NAME)/handlers/main.yml
 	echo "---" > roles/$(NAME)/defaults/main.yml