Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52492

Test rewritten by Rémi Bernon.

Read that in wined3d_swapchain_apply_sample_count_override().

These two fields are always identical.

We will need them in buffers for Vulkan, as well as for software
vertex shaders. Currently we simply store them in sysmem buffers and
read directly back out of them to load GL uniforms.

This does decrease memory usage a bit for d3d10+.

All other code touching stateblocks is in stateblock.c; this is a more intuitive
and modular place for it. This may merit renaming the function, but should be a
subsequent commit.

This syncs the code with dlls/ntdll/unix/env.c add_registry_environment.
It fixes ALLUSERSPROFILE and ProgramData environment variables value
in services.