Recover BIO_number_{read|written}.

Android needs it. These functions were removed in the move to BoringSSL.

Change-Id: Ice24a0a1c390930cf07dbd00f72a3e12e6c241f9
Reviewed-on: https://boringssl-review.googlesource.com/1510
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
2 files changed