services/tests: Add #include <stdarg.h> to service.c.

[Gerald Pfeifer]

After commit 2c24272804b57137fa051f1196e3b86904bc12cb

  Author: Jacek Caban <jacek at codeweavers.com>
  Date:   Thu Feb 9 15:13:09 2017 +0100

  services/tests: Test creating windows inside non-interactive service.

builds on FreeBSD 10.x are failing with 

  ../../../include/windef.h:102:24: error: unknown type name 'va_list'; 
  did you mean '__va_list'?
   #  define __ms_va_list va_list
                          ^

Looking around a little, it appears other files using <windef.h> do
include <stdarg.h> before, and indeed this fixes the build for me.

Gerald

Signed-off-by: Gerald Pfeifer <gerald at pfeifer.com>
---
 programs/services/tests/service.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/programs/services/tests/service.c b/programs/services/tests/service.c
index 0e9bcd7486..98419497a5 100644
--- a/programs/services/tests/service.c
+++ b/programs/services/tests/service.c
@@ -16,6 +16,8 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+#include <stdarg.h>
+
 #include <windef.h>
 #include <winsvc.h>
 #include <stdio.h>
-- 
2.11.0