Let the TLSv1_method() etc. functions return a const SSL_METHOD
pointer and make the SSL_METHOD parameter in SSL_CTX_new,
SSL_CTX_set_ssl_version and SSL_set_ssl_method const.
diff --git a/doc/ssl/SSL_CTX_new.pod b/doc/ssl/SSL_CTX_new.pod
index 465220a..73e8c47 100644
--- a/doc/ssl/SSL_CTX_new.pod
+++ b/doc/ssl/SSL_CTX_new.pod
@@ -8,7 +8,7 @@
 
  #include <openssl/ssl.h>
 
- SSL_CTX *SSL_CTX_new(SSL_METHOD *method);
+ SSL_CTX *SSL_CTX_new(const SSL_METHOD *method);
 
 =head1 DESCRIPTION