Problem: gssapi_client does not have a peer_address param

Solution: remove it from the gssapi_mechanism_base initialiser

src/gssapi_mechanism_base.cpp

@@ -42,7 +42,6 @@
 
 zmq::gssapi_mechanism_base_t::gssapi_mechanism_base_t (
   session_base_t *session_,
-  const std::string &peer_address_,
   const options_t &options_) :
     mechanism_base_t (session_, options_),
     send_tok (),

src/gssapi_mechanism_base.hpp

@@ -53,7 +53,6 @@ namespace zmq
     {
       public:
         gssapi_mechanism_base_t (session_base_t *session_,
-                                 const std::string &peer_address_,
                                  const options_t &options_);
         virtual ~gssapi_mechanism_base_t () = 0;