Revert vulkan conditional changes as it broke s390x deps
It's too invasive to drop mesa-vulkan-drivers and mesa-vulkan-devel in a stable
release with other packages build requiring it.
This reverts commit a8d9dcff3fb45a392e2b0b43f3c9e888315d9f63.
This reverts commit 26ef46f507559d980e1e91f20e66463d5503bf3e.