Please pull my building script contributions

Kevin,

Currently this modified version of the script has these new features:

- building of packages without installing them on the system
- building of a single x11rdp package instead of 102 packages
- avoid building x11rdp via --nox11rdp CLI flag
- inclusion of the correct architecture and description fields in the packages 
- uniformization of package names
- removal of some repeated code and code simplification at some places

I kindly ask you to review this and pull it if you like the changes.