[gssdp] sniffer: Build as GUI application

[Jens Georg <jensgeorg src gnome org>]

commit abe51be4c5155aef709462ec8cfcd5ed581fb5f0
Author: Jens Georg <mail jensge org>
Date:   Sun Nov 11 07:18:26 2018 +0100

    sniffer: Build as GUI application
    
    This means that on windows it will not open a console window

 tools/meson.build | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/tools/meson.build b/tools/meson.build
index b4b7aee..bfd44d2 100644
--- a/tools/meson.build
+++ b/tools/meson.build
@@ -11,5 +11,6 @@ sniffer = executable(
     ],
     dependencies : [gssdp, gtk],
     install: true,
-    export_dynamic : true
+    export_dynamic : true,
+    gui_app : true
 )