Avoid including cryptlib.h, it's not really needed.

Check if IDEA is being built or not.
This is part of a large change submitted by Markus Friedl <markus@openbsd.org>

ssl/s2_pkt.c

@@ -113,7 +113,6 @@
 #ifndef OPENSSL_NO_SSL2
 #include <stdio.h>
 #include <errno.h>
-#include "cryptlib.h"
 #define USE_SOCKETS
 
 static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend);