external/boringssl: Sync to c9827e073f64e353c4891ecc2c73721882543ee0.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/387b07b78dac785a341eeb2ff86e29393ffe8627..c9827e073f64e353c4891ecc2c73721882543ee0

Test: atest CtsLibcoreTestCases (TODO)
Change-Id: Ie7c2899ac4ea374113e0fe3b76f9a4dce36ea8de
diff --git a/src/ssl/t1_lib.cc b/src/ssl/t1_lib.cc
index c0452dc..87f1888 100644
--- a/src/ssl/t1_lib.cc
+++ b/src/ssl/t1_lib.cc
@@ -199,10 +199,10 @@
   return true;
 }
 
-bool ssl_client_hello_init(SSL *ssl, SSL_CLIENT_HELLO *out,
+bool ssl_client_hello_init(const SSL *ssl, SSL_CLIENT_HELLO *out,
                            const SSLMessage &msg) {
   OPENSSL_memset(out, 0, sizeof(*out));
-  out->ssl = ssl;
+  out->ssl = const_cast<SSL *>(ssl);
   out->client_hello = CBS_data(&msg.body);
   out->client_hello_len = CBS_len(&msg.body);