The rules were missing the `Debug/` prefix.

Bug: b/145758253
Change-Id: Ia5b9e4f162c6f685e15bf26ab492dcebc93b844d
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/43850Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>