kex: Fix some build warnings.

include/libssh/kex.h

@@ -37,7 +37,9 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit);
 SSH_PACKET_CALLBACK(ssh_packet_publickey1);
 #endif
 
+extern const char *supported_methods[];
 extern const char *ssh_kex_nums[];
+
 int ssh_send_kex(ssh_session session, int server_kex);
 void ssh_list_kex(ssh_session session, struct ssh_kex_struct *kex);
 int set_client_kex(ssh_session session);

src/kex.c

@@ -70,7 +70,7 @@
 #define KEY_EXCHANGE "diffie-hellman-group1-sha1"
 #endif
 
-const char *default_methods[] = {
+static const char *default_methods[] = {
   KEY_EXCHANGE,
   "ssh-rsa,ssh-dss",
   AES BLOWFISH DES,

src/server.c

@@ -52,6 +52,7 @@
 #include "libssh/packet.h"
 #include "libssh/socket.h"
 #include "libssh/session.h"
+#include "libssh/kex.h"
 #include "libssh/misc.h"
 #include "libssh/pki.h"
 #include "libssh/dh.h"
@@ -72,8 +73,6 @@ static int dh_handshake_server(ssh_session session);
  * @{
  */
 
-extern const char *supported_methods[];
-
 /** @internal
  * This functions sets the Key Exchange protocols to be accepted
  * by the server. They depend on