New option no-ssl3-method which removes SSLv3_*method

When no-ssl3 is set only make SSLv3 disabled by default. Retain -ssl3
options for s_client/s_server/ssltest.

When no-ssl3-method is set SSLv3_*method() is removed and all -ssl3
options.

We should document this somewhere, e.g. wiki, FAQ or manual page.
Reviewed-by: Emilia Käsper <emilia@openssl.org>

(cherry picked from commit 3881d8106d)

ssl/s3_srvr.c

@@ -170,6 +170,7 @@
 #endif
 #include <openssl/md5.h>
 
+#ifndef OPENSSL_NO_SSL3_METHOD
 static const SSL_METHOD *ssl3_get_server_method(int ver);
 
 static const SSL_METHOD *ssl3_get_server_method(int ver)
@@ -180,6 +181,12 @@ static const SSL_METHOD *ssl3_get_server_method(int ver)
 		return(NULL);
 	}
 
+IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
+			ssl3_accept,
+			ssl_undefined_function,
+			ssl3_get_server_method)
+#endif
+
 #ifndef OPENSSL_NO_SRP
 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
 	{
@@ -206,11 +213,6 @@ static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
 	}
 #endif
 
-IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
-			ssl3_accept,
-			ssl_undefined_function,
-			ssl3_get_server_method)
-
 int ssl3_accept(SSL *s)
 	{
 	BUF_MEM *buf;