Add SSL_get_client_certificate_types.

openssl/ssl/ssl3.h

 /* ssl/ssl3.h */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
  * This package is an SSL implementation written
  * by Eric Young (eay@cryptsoft.com).
  * The implementation was written so as to conform with Netscapes SSL.
  * 
  * This library is free for commercial and non-commercial use as long as
  * the following conditions are aheared to.  The following conditions
@@ skipping 490 matching lines @@
 #endif
 
                 /* used when SSL_ST_FLUSH_DATA is entered */
                 int next_state;                 
 
                 int reuse_message;
 
                 /* used for certificate requests */
                 int cert_req;
                 int ctype_num;
-                char ctype[SSL3_CT_NUMBER];
+                unsigned char ctype[SSL3_CT_NUMBER];
                 STACK_OF(X509_NAME) *ca_names;
 
                 int use_rsa_tmp;
 
                 int key_block_length;
                 unsigned char *key_block;
 
                 const EVP_CIPHER *new_sym_enc;
                 const EVP_AEAD *new_aead;
                 const EVP_MD *new_hash;
@@ skipping 172 matching lines @@
 #define SSL3_CHANGE_CIPHER_CLIENT_WRITE (SSL3_CC_CLIENT|SSL3_CC_WRITE)  
 #define SSL3_CHANGE_CIPHER_SERVER_READ  (SSL3_CC_SERVER|SSL3_CC_READ)
 #define SSL3_CHANGE_CIPHER_CLIENT_READ  (SSL3_CC_CLIENT|SSL3_CC_READ)
 #define SSL3_CHANGE_CIPHER_SERVER_WRITE (SSL3_CC_SERVER|SSL3_CC_WRITE)
 
 #ifdef  __cplusplus
 }
 #endif
 #endif