There's no point writing these to disk, we just overwrite them with the next test.
Unfortunately there's no way to actually disable writing these files.

Think green! Save a SSD!

Change-Id: Ib4f7f9417839acf491eac1828bbae7b067988e06
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/44015Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>