Replace |()| with |(void)| in some prototypes to avoid compiler warnings about old-style prototypes when building in some non-default configurations for ARM. Change-Id: Id57825084941c997bb7c41ec8ed94962f97ff732 Reviewed-on: https://boringssl-review.googlesource.com/5570 Reviewed-by: Adam Langley <agl@google.com>