build: unify vulkan cpp platform args
these were duplicated all over the place, and it's annoying to have to keep duplicating them any time a new component includes the vulkan header
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Our infrastructure migration is complete. Please remember to update your SSH remote to point to ssh.gitlab.freedesktop.org; SSH to the old hostname will time out. You should not see any problems apart from that. Please let us know if you do have any other issues.
these were duplicated all over the place, and it's annoying to have to keep duplicating them any time a new component includes the vulkan header