[gtk-vnc] connection: adapt to libgcrypt >= 1.6

[Fabiano Fidêncio <ffidencio src gnome org>]

commit 9da749d45ace038b4d27120a14403c891cc9f1df
Author: Fabiano Fidêncio <fidencio redhat com>
Date:   Mon Jan 5 14:16:31 2015 +0100

    connection: adapt to libgcrypt >= 1.6
    
    From "gcrypt.h":
    
    > NOTE: Since Libgcrypt 1.6 the thread callbacks are not anymore used.
    > However we keep it to allow for some source code compatibility if used
    > in the standard way.

 src/vncconnection.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/vncconnection.c b/src/vncconnection.c
index 9ef01ce..ca4d239 100644
--- a/src/vncconnection.c
+++ b/src/vncconnection.c
@@ -1171,6 +1171,7 @@ static void vnc_connection_debug_gnutls_log(int level, const char* str) {
 }
 #endif
 
+#if !defined(GCRYPT_VERSION_NUMBER) || (GCRYPT_VERSION_NUMBER < 0x010600)
 static int gvnc_tls_mutex_init (void **priv)
 {                                                                             \
     GMutex *lock = NULL;
@@ -1209,6 +1210,7 @@ static struct gcry_thread_cbs gvnc_thread_impl = {
     gvnc_tls_mutex_unlock,
     NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
 };
+#endif
 
 
 static gboolean vnc_connection_tls_initialize(void)
@@ -1219,7 +1221,9 @@ static gboolean vnc_connection_tls_initialize(void)
         return TRUE;
 
     if (g_thread_supported()) {
+#if !defined(GCRYPT_VERSION_NUMBER) || (GCRYPT_VERSION_NUMBER < 0x010600)
         gcry_control(GCRYCTL_SET_THREAD_CBS, &gvnc_thread_impl);
+#endif
         gcry_check_version(NULL);
     }