cf. https://swiftshader-review.googlesource.com/c/SwiftShader/+/43388

Bug: build fix
Change-Id: I8d2acc0bbb19fa71748aafeebd6c0d500673ed93
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/43408Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>