dist: Speed up distribution compression
dist: Speed up distribution compression

This almost reverts b7200d723648.  The size is increased from 11M to 13M
and the compression is sped up from 2 minutes to 17 seconds.  The
compression level is removed because -9 doesn't allow multiple threads
to be spawned.  Effectively speeds up distcheck as well.

Signed-off-by: Martin Kletzander <e82f23e74d43760279ebcc505dac4ae70d5627d0@redhat.com>

jfehlig/libvirt,crobinso/libvirt,jardasgit/libvirt,zippy2/libvirt,andreabolognani/libvirt,crobinso/libvirt,eskultety/libvirt,taget/libvirt,eskultety/libvirt,crobinso/libvirt,olafhering/libvirt,taget/libvirt,libvirt/libvirt,jardasgit/libvirt,libvirt/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,olafhering/libvirt,andreabolognani/libvirt,datto/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,nertpinx/libvirt,datto/libvirt,jfehlig/libvirt,taget/libvirt,datto/libvirt,libvirt/libvirt,nertpinx/libvirt,datto/libvirt,zippy2/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,olafhering/libvirt,libvirt/libvirt,jardasgit/libvirt,eskultety/libvirt,eskultety/libvirt,nertpinx/libvirt,andreabolognani/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,crobinso/libvirt,jardasgit/libvirt,zippy2/libvirt,olafhering/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,datto/libvirt,VenkatDatta/libvirt,taget/libvirt,eskultety/libvirt,VenkatDatta/libvirt,taget/libvirt,zippy2/libvirt,nertpinx/libvirt,jfehlig/libvirt,andreabolognani/libvirt