https://github.com/KhronosGroup/SPIRV-Headers/issues/137 is still ongoing.

Fixes: b/15093697
Change-Id: I2498f35a8049fb2a1a86aa0efe6fbd6e59ad6493
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/43428Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Ben Clayton <bclayton@google.com>