dtls: Fix compiler warnings with openssl 1.1 or newer

- DTLSv1_method() is deprecated, and since 1.0.2 replaced by
  DTLS_method().
- CRYPTO_set_locking_callback() and CRYPTO_set_id_callback() are
  no-ops (empty macros) since 1.1 and are not supposed to be used
  anymore.

gstdtlsagent.c: In function ‘gst_dtls_agent_init’:
gstdtlsagent.c:173:3: error: ‘DTLSv1_method’ is deprecated [-Werror=deprecated-declarations]
   priv->ssl_context = SSL_CTX_new (DTLSv1_method ());
   ^~~~
In file included from /usr/include/openssl/ct.h:13:0,
                 from /usr/include/openssl/ssl.h:61,
                 from gstdtlsagent.c:40:
/usr/include/openssl/ssl.h:1614:1: note: declared here
 DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *DTLSv1_method(void)) /* DTLSv1.0 */
 ^
At top level:
gstdtlsagent.c:103:1: error: ‘ssl_thread_id_function’ defined but not used [-Werror=unused-function]
 ssl_thread_id_function (void)
 ^~~~~~~~~~~~~~~~~~~~~~
gstdtlsagent.c:73:1: error: ‘ssl_locking_function’ defined but not used [-Werror=unused-function]
 ssl_locking_function (gint mode, gint lock_num, const gchar * file, gint line)
 ^~~~~~~~~~~~~~~~~~~~

1 files changed, 1 insertions, 2 deletions

diff --git a/ext/dtls/gstdtlssrtpdec.c b/ext/dtls/gstdtlssrtpdec.c
index 0a3bead21..633fc0f6e 100644
--- a/ext/dtls/gstdtlssrtpdec.c
+++ b/ext/dtls/gstdtlssrtpdec.c
@@ -175,8 +175,7 @@ gst_dtls_srtp_dec_init (GstDtlsSrtpDec * self)
         "failed to create srtp_dec, is the srtp plugin registered?");
     return;
   }
-  self->dtls_srtp_demux =
-      gst_element_factory_make ("dtlssrtpdemux", NULL);
+  self->dtls_srtp_demux = gst_element_factory_make ("dtlssrtpdemux", NULL);
   if (!self->dtls_srtp_demux) {
     GST_ERROR_OBJECT (self, "failed to create dtls_srtp_demux");
     return;