ci: Fix the msvc build broken with vulkan
Since we enabled Vulkan in ci, msvc builds are failing:
https://gitlab.gnome.org/GNOME/gtk/-/jobs/3734104
It seems that the meson checks find Vulkan, but the compiler still doesn't find the headers.
Since we enabled Vulkan in ci, msvc builds are failing:
https://gitlab.gnome.org/GNOME/gtk/-/jobs/3734104
It seems that the meson checks find Vulkan, but the compiler still doesn't find the headers.