[packman] llvm Packman package

[Cristian Morales Vega]

I just saw the llvm package in Packman's Extra project.

First, any cause to not use the one from obs://devel:tools:compiler?
And if there is a good cause:
- %post devel -p /sbin/ldconfig probably should be without the "devel"?
- any cause for the long (files|devel).files creation script logic in
the %install block?

Thanks.