I stumbled across this while bringing up the Chromium build
under Python3. The change should allow the code to work under
both 2 and 3 now.

Bug: chromium:1112479
Change-Id: I5ae0cafdd453a12b53a0fa5392ad46cba60f4ed4
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/47308Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>