Added "fix" for libgcrypt threading, ...

... but it doesn't seem to work. This is however the recommanded
way of initializing threading :
http://lists.gnupg.org/pipermail/gcrypt-devel/2009-February/001452.html

libssh/dh.c

@@ -104,6 +104,12 @@ int ssh_get_random(void *where, int len, int strong){
   return 1;
 }
 
+#ifdef HAVE_LIBGCRYPT
+#include <errno.h>
+#include <pthread.h>
+GCRY_THREAD_OPTION_PTHREAD_IMPL;
+#endif
+
 
 /*
  * This inits the values g and p which are used for DH key agreement
@@ -113,6 +119,7 @@ int ssh_crypto_init(void) {
   if (ssh_crypto_initialized == 0) {
 #ifdef HAVE_LIBGCRYPT
     gcry_check_version(NULL);
+  	gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
 
     if (!gcry_control(GCRYCTL_INITIALIZATION_FINISHED_P,0)) {
       gcry_control(GCRYCTL_INIT_SECMEM, 4096);