build: Have "make dist" only create a .tar.bz2
build: Have "make dist" only create a .tar.bz2

We don't offer .tar.gz tarballs on ftp.gnome.org anymore, and the .zip
was not uploaded anyway.

Carbenium/banshee,ixfalia/banshee,stsundermann/banshee,GNOME/banshee,Dynalon/banshee-osx,arfbtwn/banshee,Dynalon/banshee-osx,dufoli/banshee,stsundermann/banshee,arfbtwn/banshee,babycaseny/banshee,Carbenium/banshee,dufoli/banshee,Carbenium/banshee,arfbtwn/banshee,babycaseny/banshee,stsundermann/banshee,Carbenium/banshee,Carbenium/banshee,arfbtwn/banshee,arfbtwn/banshee,ixfalia/banshee,stsundermann/banshee,Dynalon/banshee-osx,dufoli/banshee,GNOME/banshee,ixfalia/banshee,babycaseny/banshee,stsundermann/banshee,Carbenium/banshee,Dynalon/banshee-osx,ixfalia/banshee,arfbtwn/banshee,dufoli/banshee,babycaseny/banshee,arfbtwn/banshee,stsundermann/banshee,GNOME/banshee,ixfalia/banshee,dufoli/banshee,babycaseny/banshee,GNOME/banshee,GNOME/banshee,Dynalon/banshee-osx,Dynalon/banshee-osx,arfbtwn/banshee,dufoli/banshee,babycaseny/banshee,babycaseny/banshee,Dynalon/banshee-osx,ixfalia/banshee,stsundermann/banshee,ixfalia/banshee,GNOME/banshee,GNOME/banshee,babycaseny/banshee,GNOME/banshee,ixfalia/banshee,dufoli/banshee,stsundermann/banshee,dufoli/banshee,Dynalon/banshee-osx