This prevents clashes between intermediates. Also update the D3D8
project to not depend on debug macro implementations in the
SwiftShader layer.

Bug b/29024574

Change-Id: I206b750bf752e3b47867f35379a82f32549a7843
Reviewed-on: https://swiftshader-review.googlesource.com/c/21348Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>