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
 

apps/s_client.c

@@ -91,10 +91,6 @@ typedef unsigned int u_int;
 #undef FIONBIO
 #endif
 
-#if defined(NO_RSA) && !defined(NO_SSL2)
-#define NO_SSL2
-#endif
-
 #undef PROG
 #define PROG	s_client_main
 

apps/s_server.c

@@ -94,10 +94,6 @@ typedef unsigned int u_int;
 #undef FIONBIO
 #endif
 
-#if defined(NO_RSA) && !defined(NO_SSL2)
-#define NO_SSL2
-#endif
-
 #ifndef NO_RSA
 static RSA MS_CALLBACK *tmp_rsa_cb(SSL *s, int is_export, int keylength);
 #endif

apps/s_time.c

@@ -67,10 +67,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-#if defined(NO_RSA) && !defined(NO_SSL2)
-#define NO_SSL2
-#endif
-
 #ifdef NO_STDIO
 #define APPS_WIN16
 #endif