Undo rename of tlsext_tick_lifetime_hint.

It was renamed to ticket_liftetime_hint in
1e6f11a7ff72bea394e6651b512e435fbc95d323, which breaks Qt.

Change-Id: I9c6d3097fe96e669f06a4e0880bd4d7d82b03ba8
Reviewed-on: https://boringssl-review.googlesource.com/10181
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

include/openssl/ssl.h

diff --git a/include/openssl/ssl.h b/include/openssl/ssl.h
index ea33999..af77f99 100644
--- a/include/openssl/ssl.h
+++ b/include/openssl/ssl.h
@@ -3697,7 +3697,7 @@
   uint8_t original_handshake_hash[EVP_MAX_MD_SIZE];
   unsigned original_handshake_hash_len;
 
-  uint32_t ticket_lifetime_hint; /* Session lifetime hint in seconds */
+  uint32_t tlsext_tick_lifetime_hint; /* Session lifetime hint in seconds */
 
   uint32_t ticket_flags;
   uint32_t ticket_age_add;