Merge pull request #988 from exarkun/ssl-state-string

SSL_state_string_long to support pyOpenSSL `Connection.state_string`
diff --git a/cryptography/hazmat/bindings/openssl/ssl.py b/cryptography/hazmat/bindings/openssl/ssl.py
index 7ed42f9..0b15411 100644
--- a/cryptography/hazmat/bindings/openssl/ssl.py
+++ b/cryptography/hazmat/bindings/openssl/ssl.py
@@ -160,6 +160,7 @@
 int SSL_library_init(void);
 
 /*  SSL */
+const char *SSL_state_string_long(const SSL *);
 SSL_SESSION *SSL_get1_session(SSL *);
 int SSL_set_session(SSL *, SSL_SESSION *);
 int SSL_get_verify_mode(const SSL *);