s3: Fix the build when compiling without JSON support

s3: Fix the build when compiling without JSON support

[3762/3895] Compiling source3/utils/net_ads_gpo.c
../source3/utils/net_ads.c: In function ‘net_ads_cldap_netlogon_json’:
../source3/utils/net_ads.c:311:2: error: parameter name omitted
  (ADS_STRUCT *, const char *,
  ^
../source3/utils/net_ads.c:311:2: error: parameter name omitted
../source3/utils/net_ads.c:312:16: error: parameter name omitted
   const struct NETLOGON_SAM_LOGON_RESPONSE_EX *)
                ^
../source3/utils/net_ads.c: In function ‘net_ads_info_json’:
../source3/utils/net_ads.c:520:1: error: parameter name omitted
 static int net_ads_info_json(ADS_STRUCT *)
 ^

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Mon Sep 24 07:03:09 CEST 2018 on sn-devel-144