Make some CLIENTHELLO_MSG function arguments const

There were a few places where they could be declared const so this commit
does that.

Reviewed-by: Kurt Roeckx <kurt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 100c9f9..6598776 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -1701,7 +1701,7 @@
  * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
  * 10.8..10.8.3 (which don't work).
  */
-static void ssl_check_for_safari(SSL *s, CLIENTHELLO_MSG *hello)
+static void ssl_check_for_safari(SSL *s, const CLIENTHELLO_MSG *hello)
 {
     unsigned int type;
     PACKET sni, tmppkt;
@@ -2905,7 +2905,7 @@
  *  1 on success
  *  0 on error
  */
-int tls_check_client_ems_support(SSL *s, CLIENTHELLO_MSG *hello)
+int tls_check_client_ems_support(SSL *s, const CLIENTHELLO_MSG *hello)
 {
     RAW_EXTENSION *emsext;