CMake should be used instead.

Note that the CMake build does not support the D3D9 and D3D8 targets.
They can still be built with Visual Studio 2019 from the 'legacy-d3d9'
branch.

Bug: b/139189696
Change-Id: I7b5006fa98e479d6d1a3bb75d379a5818a560c20
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/43231
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>