It's useful, when combined with patching crypto/rand/deterministic.c in, for
debugging things. Also if we want to record fuzzer transcripts again, this
probably should be on.
Change-Id: I109cf27ebab64f01a13466f0d960def3257d8750
Reviewed-on: https://boringssl-review.googlesource.com/8192
Reviewed-by: David Benjamin <davidben@google.com>
