don't reference GnuTLS headers and functions unless the configure script found it

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@65966 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_gtalk.c

@@ -47,10 +47,12 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #include <arpa/inet.h>
 #include <sys/signal.h>
 #include <iksemel.h>
-
-#include <gcrypt.h>
 #include <pthread.h>
+
+#if HAVE_GNUTLS
+#include <gcrypt.h>
 GCRY_THREAD_OPTION_PTHREAD_IMPL;
+#endif /* HAVE_GNUTLS */
 
 #include "asterisk/lock.h"
 #include "asterisk/channel.h"
@@ -1809,7 +1811,9 @@ static int gtalk_load_config(void)
 /*! \brief Load module into PBX, register channel */
 static int load_module(void)
 {
+#if HAVE_GNUTLS	
         gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
+#endif /* HAVE_GNUTLS */
 
 	ASTOBJ_CONTAINER_INIT(&gtalk_list);
 	if (!gtalk_load_config()) {