Fix 2 build bugs

• On my machine, reading all configs lazily caused resource exhaustion since we'd open too many all at once.
• ben-raytrace didn't build with >=9.13

real/ben-raytrace/SamplerMonad/Naive.hs

@@ -32,6 +32,7 @@ gen = SamplerGen
 instance StatefulGen Gen (SamplerM s) where
   uniformWord64 _ = SamplerM $ StateT $ pure . genWord64
   uniformShortByteString = undefined
+  uniformByteArrayM = undefined
 
 runSamplerM
     :: Word64 -> (forall s. SamplerM s a) -> a