This reverts commit 115a1901:
the change has not been tested properly unfortunately,
and it broke today's regular-rc builds fortunately;
there are no vulkan-{intel,radeon} packages in sisyphus
(only amdgpu), and these are present in lakostis@' repo:
http://www.unsafe.ru/lakostis/RPMS/ALTLinux/glvnd/repo/x86_64/RPMS.hasher/

Just drop the whole thing until it gets sorted out.