Add an option for buildall to build on deb- even if it detects other systems.

[blue-devil-93]

Tried to build your Scripts on asmi linux. Which is a small xubuntu based iso image. It will detect rpm. Had to disable the detect os sh a bit and then it compiles nicely. No issue here but can you please add a switch to skip operatig system check for the build scripts if an user knows that deb is the wanted package architecture?