makerepropkg: Add -n to allow running makepkg with --nocheck
This allows checking if running the build with/without tests has an impact on the build output.
These two commands would be equivalent:
makerepropkg -n python-bcrypt-4.0.1-3-x86_64.pkg.tar.zst
archlinux-repro -f -n python-bcrypt-4.0.1-3-x86_64.pkg.tar.zst