https://bugzilla.redhat.com/show_bug.cgi?id=1274978
--- Comment #7 from Oded Gabbay ogabbay@redhat.com --- Because you are using a wrong link. It's not https://wiki.freedesktop.org/xorg/archive/individual/lib/hsakmt-1.0.0.tar.bz...
It's http://xorg.freedesktop.org/archive/individual/lib/hsakmt-1.0.0.tar.bz2
The 404 error you get is because that link is wrong and it can't find the file to download.
I downloaded the file from the correct link and compared sha256sum to the tar inside the srpm and they are identical