https://swiftshader-review.googlesource.com/c/SwiftShader/+/35939
was submitted without being properly rebased. Unfortunately, the
merge was successful on the gerrit server, but led to a broken
Linux build for swiftshader_libvulkan. This fixes the issue.

Bug: 140419396
Change-Id: Ib3167e11ea4c4957cf28fa7b45305e98ca27c413
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/37289
Kokoro-Presubmit: David Turner <digit@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: David Turner <digit@google.com>
Presubmit-Ready: David Turner <digit@google.com>