New comment by q66 on void-packages repository

https://github.com/void-linux/void-packages/pull/33087#issuecomment-926644272

Comment:
make vulkan and drm `build_options`, put them in `build_options_default`

for `vulkan`, add conditional `makedepends` on `vulkan-loader Vulkan-Headers`

for `drm`, add conditional `makedepends` on `libdrm-devel`