Add missing #ifndefs that caused missing symbols when building libssl

as a shared library without RSA.  Use #ifndef NO_SSL2 instead of
NO_RSA in ssl/s2*.c.

Submitted by: Kris Kennaway <kris@hub.freebsd.org>
Modified by Ulf Möller

apps/ciphers.c

@@ -66,10 +66,6 @@
 #include <openssl/err.h>
 #include <openssl/ssl.h>
 
-#if defined(NO_RSA) && !defined(NO_SSL2)
-#define NO_SSL2
-#endif
-
 #undef PROG
 #define PROG	ciphers_main