Use have_version in clamping TLS record-layer version to 1.0.

Match the DTLS code. Rather than sniffing the handshake state, use the
have_version bit.

Change-Id: I40e92f187647417c34b4cfdc3ad258f5562e781b
Reviewed-on: https://boringssl-review.googlesource.com/2588
Reviewed-by: Adam Langley <agl@google.com>
1 file changed