gnutls: require version 3.1.4 or later

configure.ac

@@ -4064,7 +4064,7 @@ dnl
 AC_ARG_ENABLE(gnutls,
   [  --enable-gnutls         GNU TLS TLS/SSL support (default enabled)])
 AS_IF([test "${enable_gnutls}" != "no"], [
-  PKG_CHECK_MODULES(GNUTLS, [gnutls >= 3.0.20], [
+  PKG_CHECK_MODULES(GNUTLS, [gnutls >= 3.1.4], [
     VLC_ADD_PLUGIN([gnutls])
   ], [
     AS_IF([test -n "${enable_gnutls}"], [

modules/misc/gnutls.c

@@ -104,7 +104,7 @@ static int gnutls_Init (vlc_object_t *p_this)
         goto error;
     }
 
-    const char *psz_version = gnutls_check_version ("3.0.20");
+    const char *psz_version = gnutls_check_version ("3.1.4");
     if (psz_version == NULL)
     {
         msg_Err (p_this, "unsupported GnuTLS version");