With this fix, SwiftShader libraries can successfully be built
on Windows using Chromium's build system and produce fully
functional libraries. Main issue was: the .rc files had not been
included in the 'sources' section.

Change-Id: Iec77f09c10af19828c52f10d01b405a7e352afab
Reviewed-on: https://swiftshader-review.googlesource.com/5800Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Corentin Wallez <cwallez@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>