It was already unused.

Bug: b/129403963
Change-Id: Idd4d7d1b64bb6380364e86823787ce54bc1cf8ab
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/39730
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>