[glib] build: Fix Meson checks for res_nclose() and res_ndestroy()

[Philip Withnall <pwithnall src gnome org>]

commit 0cd5127494fb550ba40f32c950899884d8473af1
Author: Philip Withnall <withnall endlessm com>
Date:   Fri Feb 9 19:01:45 2018 +0000

    build: Fix Meson checks for res_nclose() and res_ndestroy()
    
    The checks wouldn’t compile, and hence would always fail.
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=793291

 gio/meson.build | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/gio/meson.build b/gio/meson.build
index 1d61d235d..848851073 100644
--- a/gio/meson.build
+++ b/gio/meson.build
@@ -94,7 +94,8 @@ if host_system != 'windows'
                  #include <resolv.h>
                  int main (int argc, char ** argv) {
                    struct __res_state res;
-                   return res_nclose(&res);
+                   res_nclose(&res);
+                   return 0;
                  }''', args : network_args, name : 'res_nclose()')
     glib_conf.set('HAVE_RES_NCLOSE', 1)
   endif
@@ -106,7 +107,8 @@ if host_system != 'windows'
                  #include <resolv.h>
                  int main (int argc, char ** argv) {
                    struct __res_state res;
-                   return res_ndestroy(&res);
+                   res_ndestroy(&res);
+                   return 0;
                  }''', args : network_args, name : 'res_ndestroy()')
     glib_conf.set('HAVE_RES_NDESTROY', 1)
   endif