[BUG] Makefile associated with NDS-H benchmark is not Mac Friendly

[sayedbilalbari]

• Not idempotent. There needs to be a clean target.
• () are not good practice in shell variable names (parens are used for execution), use {} to enclose variable names instead
• sed with in place editing -i should include a backup file as best practice, and is required when running on a Mac
• zsh on Mac does not interpolate $$ without escaping