Bugfix, own collection:

Random seeding is still not perfect in render, especially lack of good
thread support still.

- VectorBlur node was calling seed for each exec, causing other nodes to
  get fixed random too.
- added seed in non-OSA main loop for render
- use BLI_srandom, is better than BLI_srand

source/blender/blenlib/intern/rand.c

@@ -171,6 +171,9 @@ void BLI_thread_srandom(int thread, unsigned int seed)
 {
 	extern unsigned char hash[];	// noise.c
 	
+	if(thread >= MAX_RNG_THREADS)
+		thread= 0;
+	
 	rng_seed(&rng_tab[thread], seed + hash[seed & 255]);
 	seed= rng_getInt(&rng_tab[thread]);
 	rng_seed(&rng_tab[thread], seed + hash[seed & 255]);