This causes Visual Studio to default to the x64 configuration, which is
64-bit instead of 32-bit.

Change-Id: Ifb1246216c726e6ad0dcc7891f2f3a8f89aeff7c
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/26649Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>