vulkan: Remove the pre-compiled shaders

vulkan: Remove the pre-compiled shaders

Instead, build-depnd on glslc to build them.

glslc is available in all important distros for a while:
  Fedora >= 28
  Ubuntu >= 23.04
  Debian >= 12
  Arch
  Opensuse >= 15.2
  msys2
are the ones I checked.

So we can depend on it and avoid having to deal with keeping spirv files
up-to-date in all commits.

It's also 700kB of data, and not updating it helps.