configure: Make dist tarballs with a bit more modern tar
configure: Make dist tarballs with a bit more modern tar

The default tar-v7 is really ancient and has problems with long
file names. Choose tar-ustar which is from 1998 and shouldn't have
such problems.

Reviewed-by: Dominik Perpeet <f7830b2723a5db4fc185058b06cfab4b89a38da9@redhat.com>

arilivigni/cockpit,dperpeet/cockpit,petervo/cockpit,Scribery/cockpit,larskarlitski/cockpit,stefwalter/cockpit,Scribery/cockpit,mareklibra/cockpit,deryni/cockpit,FireDrunk/cockpit,petervo/cockpit,jscotka/cockpit,dperpeet/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,jscotka/cockpit,jscotka/cockpit,dperpeet/cockpit,sgallagher/cockpit,SotolitoLabs/cockpit,cockpit-project/cockpit,dperpeet/cockpit,harishanand95/cockpit,larskarlitski/cockpit,harishanand95/cockpit,matobet/cockpit,arilivigni/cockpit,larsu/cockpit,vanloswang/cockpit,dperpeet/cockpit,mareklibra/cockpit,FireDrunk/cockpit,sgallagher/cockpit,mareklibra/cockpit,matobet/cockpit,garrett/cockpit,garrett/cockpit,andreasn/cockpit,petervo/cockpit,mareklibra/cockpit,larsu/cockpit,arilivigni/cockpit,michalskrivanek/cockpit,mareklibra/cockpit,cockpituous/cockpit,cockpituous/cockpit,xhad/cockpit,larskarlitski/cockpit,moraleslazaro/cockpit,petervo/cockpit,arilivigni/cockpit,vanloswang/cockpit,vanloswang/cockpit,xhad/cockpit,Scribery/cockpit,stefwalter/cockpit,xhad/cockpit,larsu/cockpit,jscotka/cockpit,matobet/cockpit,vanloswang/cockpit,sgallagher/cockpit,cockpit-project/cockpit,martinpitt/cockpit,SotolitoLabs/cockpit,michalskrivanek/cockpit,Scribery/cockpit,michalskrivanek/cockpit,michalskrivanek/cockpit,martinpitt/cockpit,cockpituous/cockpit,larskarlitski/cockpit,sgallagher/cockpit,moraleslazaro/cockpit,stefwalter/cockpit,andreasn/cockpit,larskarlitski/cockpit,moraleslazaro/cockpit,xhad/cockpit,michalskrivanek/cockpit,larsu/cockpit,mvollmer/cockpit,harishanand95/cockpit,andreasn/cockpit,michalskrivanek/cockpit,deryni/cockpit,jscotka/cockpit,deryni/cockpit,harishanand95/cockpit,sgallagher/cockpit,sgallagher/cockpit,stefwalter/cockpit,garrett/cockpit,cockpit-project/cockpit,matobet/cockpit,martinpitt/cockpit,SotolitoLabs/cockpit,martinpitt/cockpit,arilivigni/cockpit,andreasn/cockpit,andreasn/cockpit,harishanand95/cockpit,michalskrivanek/cockpit,xhad/cockpit,vanloswang/cockpit,mvollmer/cockpit,dperpeet/cockpit,jscotka/cockpit,mareklibra/cockpit,sgallagher/cockpit,larskarlitski/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,petervo/cockpit,stefwalter/cockpit,deryni/cockpit,FireDrunk/cockpit,andreasn/cockpit,garrett/cockpit,arilivigni/cockpit,petervo/cockpit,cockpit-project/cockpit,matobet/cockpit,garrett/cockpit,moraleslazaro/cockpit,deryni/cockpit,cockpit-project/cockpit,Scribery/cockpit,FireDrunk/cockpit,Scribery/cockpit,SotolitoLabs/cockpit,deryni/cockpit,dperpeet/cockpit,mvollmer/cockpit,SotolitoLabs/cockpit,cockpituous/cockpit,andreasn/cockpit,FireDrunk/cockpit,petervo/cockpit,larsu/cockpit,larsu/cockpit,mareklibra/cockpit,mvollmer/cockpit,matobet/cockpit,cockpituous/cockpit,SotolitoLabs/cockpit,arilivigni/cockpit,harishanand95/cockpit,Scribery/cockpit,deryni/cockpit,stefwalter/cockpit,martinpitt/cockpit,xhad/cockpit,vanloswang/cockpit,larskarlitski/cockpit,vanloswang/cockpit,SotolitoLabs/cockpit,mvollmer/cockpit,harishanand95/cockpit,xhad/cockpit,stefwalter/cockpit