Rename ssl_set_handshake_header2()

ssl_set_handshake_header2() was only ever a temporary name while we had
to have ssl_set_handshake_header() for code that hadn't been converted to
WPACKET yet. No code remains that needed that so we can rename it.

Reviewed-by: Rich Salz <rsalz@openssl.org>
diff --git a/ssl/s3_lib.c b/ssl/s3_lib.c
index 02cf88b..630c94d 100644
--- a/ssl/s3_lib.c
+++ b/ssl/s3_lib.c
@@ -2750,7 +2750,7 @@
              int use_context))ssl_undefined_function,
     0,
     SSL3_HM_HEADER_LENGTH,
-    ssl3_set_handshake_header2,
+    ssl3_set_handshake_header,
     tls_close_construct_packet,
     ssl3_handshake_write
 };
@@ -2777,13 +2777,7 @@
         return (NULL);
 }
 
-/*
- * Temporary name. To be renamed ssl3_set_handshake_header() once all WPACKET
- * conversion is complete. The old ssl3_set_handshake_heder() can be deleted
- * at that point.
- * TODO - RENAME ME
- */
-int ssl3_set_handshake_header2(SSL *s, WPACKET *pkt, int htype)
+int ssl3_set_handshake_header(SSL *s, WPACKET *pkt, int htype)
 {
     /* Set the content type and 3 bytes for the message len */
     if (!WPACKET_put_bytes_u8(pkt, htype)