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.
Otherwise, we get a deprecation warning which is turned into an error:
```
CC libcollectdclient_la-network_buffer.lo
../../../src/libcollectdclient/network_buffer.c:58:15: error: 'gcry_thread_cbs' is deprecated (declared at /usr/include/gcrypt.h:213) [-Werror=deprecated-declarations]
GCRY_THREAD_OPTION_PTHREAD_IMPL;
```
Fixes: #632
/* Re enable deprecation warnings */
# pragma GCC diagnostic warning "-Wdeprecated-declarations"
# endif
/* Re enable deprecation warnings */
# pragma GCC diagnostic warning "-Wdeprecated-declarations"
# endif
+# if GCRYPT_VERSION_NUMBER < 0x010600
GCRY_THREAD_OPTION_PTHREAD_IMPL;
GCRY_THREAD_OPTION_PTHREAD_IMPL;
#endif
#include "collectd/network_buffer.h"
#endif
#include "collectd/network_buffer.h"
need_init = 0;
#if HAVE_LIBGCRYPT
need_init = 0;
#if HAVE_LIBGCRYPT
+# if GCRYPT_VERSION_NUMBER < 0x010600
gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
if (!gcry_check_version (GCRYPT_VERSION))
return (0);
if (!gcry_check_version (GCRYPT_VERSION))
return (0);
/* Re enable deprecation warnings */
# pragma GCC diagnostic warning "-Wdeprecated-declarations"
# endif
/* Re enable deprecation warnings */
# pragma GCC diagnostic warning "-Wdeprecated-declarations"
# endif
+# if GCRYPT_VERSION_NUMBER < 0x010600
GCRY_THREAD_OPTION_PTHREAD_IMPL;
GCRY_THREAD_OPTION_PTHREAD_IMPL;
#endif
#ifndef IPV6_ADD_MEMBERSHIP
#endif
#ifndef IPV6_ADD_MEMBERSHIP
* above doesn't count, as it doesn't implicitly initalize Libgcrypt.
*
* tl;dr: keep all these gry_* statements in this exact order please. */
* above doesn't count, as it doesn't implicitly initalize Libgcrypt.
*
* tl;dr: keep all these gry_* statements in this exact order please. */
+# if GCRYPT_VERSION_NUMBER < 0x010600
gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
gcry_check_version (NULL);
gcry_control (GCRYCTL_INIT_SECMEM, 32768);
gcry_control (GCRYCTL_INITIALIZATION_FINISHED);
gcry_check_version (NULL);
gcry_control (GCRYCTL_INIT_SECMEM, 32768);
gcry_control (GCRYCTL_INITIALIZATION_FINISHED);